19. Privacy and data protection law applied to AI
Data protection law already binds every AI system that touches personal data; this chapter turns its duties for training, inference, rights and breaches into artefacts, stack layers and evidence.
New to the field? Start with what AI governance is and which frameworks shape it.
Key terms in this chapter
Privacy law was the first AI law. The GDPR has applied since 25 May 2018 to any processing of personal data, and a model trained on, retrieving from or deciding about people processes personal data at several points of its life1. The AI Act adds duties on top without displacing data protection, and says so in its own text2. The privacy duties usually arrive first, carry fines of up to EUR 20 million or 4% of worldwide annual turnover for breaches of the core principles1, and reach systems the AI Act never classifies as high-risk.
The GDPR is the spine here, with short contrasts to UK GDPR, the US state laws, Brazil’s LGPD and China’s PIPL. Every duty resolves to an artefact, a stack layer (chapter 04) and an evidence record a query can return. One line of disambiguation: the data protection officer and privacy counsel decide whether a lawful basis holds; the AI governance engineer builds the record that shows the decision, the control that enforces it and the signal that says when it stopped holding. This is engineering translation, not legal advice.
How to read this chapter
An AI system processes personal data at more moments than its owners usually list, and each moment
is a separate processing operation with its own purpose, basis, retention and rights exposure. The
table uses the running example from chapter 04, csa-01, a customer-service assistant in a large
telco, fine-tuned on past support transcripts, retrieving from account notes and calling a
third-party model.
| Processing moment | Personal data (csa-01) | What the law asks first | Evidence record |
|---|---|---|---|
| Collection for training | Historic transcripts | Purpose compatibility; basis; notice | Basis registry entry |
| Training and fine-tuning | Filtered transcripts | Minimisation; special-category screening | Data card; filter log |
| Retrieval (RAG) indexing | Account notes | Access control; retention; rights reach | Index manifest |
| Inference | Live prompts and outputs | Transparency; transfers; ADM limits | Trace with policy verdicts |
| Logging and monitoring | Prompts, outputs, traces | Storage limitation; security | Retention verdicts |
| Evaluation | Golden and red-team sets | Minimisation; synthetic where possible | Eval-set card |
Data cards live in layer 02 (Inventory & Transparency); purpose, retention and residency rules in layer 01; privacy tests in layer 03; redaction, filters and routing in layer 04; and the records a regulator asks for in layer 05. Two neighbouring chapters carry the organisational side: chapter 12 on updating the policies you already have, and chapter 14 on the right to use the data at the dataset admission gate.
Principles applied to AI
Article 5 GDPR sets the principles (lawfulness, fairness and transparency; purpose limitation; data minimisation; accuracy; storage limitation; integrity and confidentiality) and makes the controller able to demonstrate compliance, the accountability duty1. For AI the principles do not change; where they bite does.
Lawful basis for training versus inference
Article 6 offers six lawful bases and none ranks above another; the controller picks the one that fits each processing activity3. The trap is to pick one basis for “the model”. Training on transcripts, indexing account notes and answering a live customer are different activities, and each needs its own basis. The Garante’s ChatGPT order shows what an unrecorded basis costs.
| Stage | Bases that usually fit | Why the choice is hard |
|---|---|---|
| Training a model on scraped or third-party data | Legitimate interests (Art. 6(1)(f)) | No relationship with the people; indirect notice; objection must work |
| Fine-tuning on customer data you hold | Legitimate interests; sometimes consent | New purpose; compatibility test; expectations |
| Retrieval over customer records | Contract (Art. 6(1)(b)) for that customer | The index must not answer one customer with another’s data |
| Inference serving the customer | Contract; legitimate interests | Necessity is narrow |
| Log monitoring and abuse review | Legitimate interests; legal obligation | Retention drifts; human review widens access |
The artefact is a basis registry: each dataset and stage carries its basis, purpose and a pointer to the assessment behind it, attached to the system’s registry entry. A training job reads it and refuses to run on a dataset whose basis does not cover training.
Legitimate interests and the three-step test
Legitimate interests is the basis AI developers are most likely to rely on4. The EDPB set out how authorities test it in Opinion 28/2024 of 17 Dec 20243. The interest must be lawful, precisely articulated, and real and present. The processing must be necessary, with no less intrusive way to reach the same end, judged with minimisation in mind. And the interest must not be overridden by the people’s rights, where reasonable expectations weigh heavily: whether the data was public, the relationship with the controller, the source and its privacy settings, whether people know their data is online3.
When the balance tips, mitigations beyond what the GDPR already requires can restore it. The EDPB’s
examples include masking names and emails with fake values, a delay between collecting a dataset and
training on it, an unconditional opt-out before processing, erasure beyond the Article 17 grounds, a
channel to report regurgitation, excluding intrusive sources and honouring robots.txt or ai.txt
when scraping, and output filters at deployment3. The CNIL adds a discretionary prior right to
object and transparency about extraction risk4.
Each mitigation is a control, so the legitimate-interest assessment (LIA) is a versioned artefact that points each mitigation at the control implementing it (the opt-out endpoint, the filter rule id, the scraping allow-list). Switch a mitigation off and the LIA goes stale; the registry should say so.
The limits of consent
Consent must be specific, informed and freely given; the controller must prove it; and people may withdraw it at any time, as easily as they gave it, with effect for the future1. Withdrawal after training does not remove a person’s influence from computed weights, so a consent-based training set commits the controller to a removal path it can actually run (see “Suppression, retraining and unlearning” below). Consent to a service is also not consent to train a model on the service’s data. The artefact is a consent-purpose log joining each consent to the datasets and model versions that inherited it; without that join a withdrawal cannot be traced to the runs it affects. China’s PIPL adds a separate consent for sensitive personal information5.
Transparency to the people in the data
Articles 13 and 14 require notice, and Article 14 covers data not collected from the person, the normal case for scraped or licensed training data1. Where Article 22 decisions are involved, notice and access must include meaningful information about the logic involved and the envisaged consequences1. A notice written for the original service rarely describes training, and a notice that described last year’s model is wrong after a retrain on new sources. Generate the notice from the same registry entry as the model card, so it changes when the sources do; the EDPB names model cards among the ways to close the information gap3.
Purpose limitation and function creep
Data may not be further processed in a way incompatible with its original purpose; Article 6(4) sets the test: the link between purposes, the context, the nature of the data, the consequences and the safeguards, such as encryption or pseudonymisation1. AI makes every stored record look like training data, and the failures are function creep: support transcripts reused to profile customers for sales, security footage reused for attendance, fraud features reused for credit limits.
The control is a purpose tag that travels with the data and a layer 01 rule that compares the purpose on the dataset’s card with the purpose declared by the consuming system, denying the run when they differ and no compatibility assessment is recorded. A denied join is proof the purpose limit bit.
Maps to: GDPR Arts. 5–7, 13, 14 · EU AI Act Art. 10, Art. 13 · ISO/IEC 42001 · ISO/IEC
27701 · NIST AI RMF (Map) · layers 01 and 02. Mappings are illustrative, not a claim of conformity.
Minimisation, privacy by design and PETs
Data must be adequate, relevant and limited to what the purpose needs, and Article 25 requires this by design (measures such as pseudonymisation built in) and by default (only the data each purpose needs is processed and made accessible)1. Machine learning pulls the other way, so minimisation is argued feature by feature, not asserted once:
- Feature-level justification. Each input feature carries a reason and a measured contribution in the data card; one with neither is removed, and special-category fields need a documented condition.
- Filtering before training. PII and special-category scans run on each snapshot and the filter log is kept with it; the EDPB lists source selection, preparation and filtering among the areas an authority examines3.
- Minimal retrieval and logs. RAG indexes hold only the fields answers need; log retention follows the obligation, not the storage default. The tension with the AI Act’s logging duties (see chapter 08) is resolved by logging what the duty needs, pseudonymised where it allows.
- Synthetic or masked eval sets wherever a test does not depend on real identities.
Anonymisation versus pseudonymisation
The distinction decides whether the GDPR applies. Pseudonymised data cannot be attributed to a person without additional information kept separately1; data that can be re-attributed with that information is still about an identifiable person1, and the EDPB’s 2025 guidelines treat pseudonymisation as a safeguard to apply well6. Anonymous data falls outside the GDPR, but Recital 26 judges identifiability against all means reasonably likely to be used, by the controller or another person, given cost, time and technology1.
In EDPS v SRB (C-413/23 P, 4 Sep 2025) the Court of Justice held that pseudonymised data is not personal data in all cases and for every person, since pseudonymisation may stop a recipient identifying anyone; but the controller’s own duties, such as informing people, are judged from the controller’s point of view at collection7. In an AI supply chain, a vendor receiving well-pseudonymised records without the key may be outside the GDPR for them; the sender is not.
Anonymisation claims decay. One study estimated that 99.98% of Americans would be correctly re-identified in any dataset using 15 demographic attributes8. Keep a re-identification assessment with each “anonymous” dataset: technique, attacker model, residual risk and date.
Privacy-enhancing technologies and their honest limits
Privacy-enhancing technologies (PETs) reduce what an attacker, vendor or insider can learn. None makes a system compliant, and each has a known failure mode.
| PET | What it does | What it does not do | Evidence record |
|---|---|---|---|
| Differential privacy | Bounds how much one record can change a result or model | Cover data outside the budget; survive a badly set or reset budget | Privacy budget per release, with accounting method |
| Federated learning | Trains where the data lives 9 | Hide data in shared gradients, which can leak examples 10 | Aggregation and DP settings |
| Synthetic data | Replaces real records for tests or sharing | Guarantee privacy: it either fails to stop inference attacks or loses utility 11 | Generator card; attack results |
| Pseudonymisation and masking | Removes direct identifiers | Make data anonymous; stop quasi-identifier linkage | Key custody record; masking rules |
| Trusted execution (enclaves) | Protects data in use from the host | Remove trust in the hardware vendor; fix memorisation | Attestation report per workload |
| Output filtering and redaction | Blocks personal data at runtime | Remove data from the model; catch every paraphrase | Guardrail decisions with rule ids |
NIST SP 800-226 is the reference for evaluating differential-privacy claims and names the “privacy hazards” that appear in implementation12. A PET claim is an eval like any other: a threshold, a named attack, a failed build when the threshold is missed.
Maps to: GDPR Art. 5(1)(c), Art. 25, Art. 32 · EU AI Act Art. 10, Art. 4a · ISO/IEC
27701 · NIST AI RMF (Measure) · Data governance across the
stack · layers 01, 03 and 04. Mappings are
illustrative, not a claim of conformity.
Controller duties across the AI supply chain
Controller, processor or joint controller
A controller decides purposes and means; a processor acts on its behalf; parties deciding together are joint controllers and must allocate responsibilities1. The AI Act’s provider and deployer do not map onto these one to one: a deployer is usually a controller, and a model provider may be your processor for inference and a controller for its own training.
| Actor | Typical GDPR role | What decides it |
|---|---|---|
| Model developer training on data it collected | Controller for training | It chose sources and purpose |
| API vendor serving your inference | Processor | It acts only on documented instructions 1 |
| The same vendor training on your prompts | Controller for that use | A processor that determines purposes is a controller for that processing 1 |
| Your organisation deploying the assistant | Controller | It decides why customers’ data is processed |
| Partners co-training on pooled data | Joint controllers | They decide purposes and means together |
Keep a role record per system and stage with the registry entry: a controller runs the DPIA and answers requests; a processor assists and notifies breaches to the controller without undue delay1.
AI vendor DPAs and no-training clauses
Article 28 requires a contract under which the processor acts only on documented instructions, including on transfers1. For AI vendors the Vendor / Model Due-Diligence Gate should check clauses a generic agreement misses:
- No training on customer data (prompts, outputs, files, embeddings, feedback), any opt-in explicit.
- Retention of prompts and outputs, including abuse-monitoring retention and staff review.
- Processing location per endpoint and feature, including support access.
- Sub-processors, with notice and objection when a model host changes.
- Deletion and return at contract end, certified.
- Breach notice on a clock that leaves room for the controller’s own 72 hours.
- Change notification when the model, its data policy or its region changes.
- Evidence: model card, security attestations and any AIBOM, delivered as stored documents.
The gate’s record (checklist answers, contract reference, date) sits on the vendor’s registry entry and is re-run on every notified change.
The DPIA for AI systems
A DPIA is required before processing likely to result in a high risk, particularly with new technologies, and always for the three Article 35(3) cases: systematic evaluation with significant automated decisions, large-scale special-category processing, and large-scale monitoring of public spaces1. The Article 29 Working Party’s guidelines, endorsed by the EDPB, give nine criteria and say processing meeting two of them will usually need a DPIA13. AI systems meet several at once:
| Criterion 13 | Typical AI case |
|---|---|
| Evaluation or scoring | Risk scores, propensity models, candidate ranking |
| Automated decisions with legal or similar effect | Credit, hiring, insurance, eligibility |
| Systematic monitoring | Workplace, video or agent-activity analytics |
| Sensitive or highly personal data | Health, biometrics, inferred traits |
| Large scale; matching or combining datasets | Web-scale corpora; merged training sets |
| Vulnerable data subjects | Employees, children, patients |
| Innovative technology | Generative models, agents, emotion analysis |
| Preventing the exercise of a right or use of a service | Automated eligibility gates |
An AI DPIA needs fields a generic template lacks: each processing moment with its basis, training sources and filtering, memorisation risk with the eval results that measure it, the ADM analysis, the vendor and transfer map, the oversight design, and the rights path for data inside the model. Article 35(7) sets the minimum content, and where residual risk stays high the controller consults the authority first, which has up to eight weeks to respond1. The EDPB expects to see DPIAs and also decisions that one was not needed3, so “no DPIA” is an artefact too. Deployers of high-risk systems use the provider’s Article 13 information for their DPIA14, and the Article 27 FRIA complements a DPIA rather than repeating it15; the FRIA-as-Code pattern writes the shared fields once. The templates page has an AI DPIA addendum in its impact-assessment schema.
Records of processing
Article 30 requires a record of processing activities (ROPA): purposes, categories of data and people, recipients, transfers, retention, security1. One AI system usually means one entry per processing moment, and the entries go stale with every pipeline change, so generate them from the registry, the data cards and the basis registry. The AI Act’s new Article 4a relies on this record: when special-category data is processed for bias detection, the ROPA must say why it was strictly necessary and why other data would not do2.
Transfers, remote inference and TIAs
Chapter V GDPR requires a ground for every transfer to a third country: adequacy, appropriate safeguards such as standard contractual clauses, or a narrow derogation1. The EDPB’s three cumulative criteria define a transfer (an exporter subject to the GDPR makes personal data available to an importer in a third country), and its guidelines treat remote access from a third country as a transfer16. For AI that covers a prompt with personal data sent to an endpoint outside the EEA, vendor telemetry carrying prompts, a failover to another region, and a foreign support team that can read logs.
Where the ground is contractual, the exporter runs a transfer impact assessment on whether the importer’s law lets it honour the clauses, adding supplementary measures as the EDPB recommends 17 under the 2021 standard contractual clauses18. For the United States, the Data Privacy Framework adequacy decision of 10 Jul 2023 covers certified organisations19, and the General Court dismissed an action to annul it on 3 Sep 202520. Record that the vendor entity is certified for the data in question.
The control extends chapter 04’s residency rule (layer 01): route inference for each data class only to endpoints whose ground is recorded, deny otherwise, and emit the verdict. The evidence is the verdict stream plus a transfer register (endpoint, region, importer, ground, TIA reference, review date).
Maps to: GDPR Arts. 26, 28, 30, 35, 36, 44–46 · EU AI Act Art. 4a, Art. 26(9),
Art. 27(4) · ISO/IEC 42001 Annex A.10 · ISO/IEC 27701 · NIST AI RMF (Govern, Map) · layers 01, 02
and 05. Mappings are illustrative, not a claim of conformity.
Automated decision-making
GDPR Article 22 after SCHUFA
Article 22 gives people the right not to be subject to a decision based solely on automated processing, including profiling, with legal or similarly significant effects. Such decisions are allowed only when necessary for a contract, authorised by law, or based on explicit consent, and then with at least the right to human intervention, to express a view and to contest1. Chapter 16 turns automated decision-making under GDPR Art. 22 into explanation and contest records.
Two judgments set the engineering task. In SCHUFA (C-634/21, 7 Dec 2023) the Court of Justice held that a credit score is itself an automated decision when lenders give it a determining role 21 (the credit-law side is in chapter 20, credit and lending). A model that “only recommends” is inside Article 22 when humans downstream follow it as a rule, and the party producing the score is itself deciding. In Dun & Bradstreet Austria (C-203/22, 27 Feb 2025) the Court held that meaningful information about the logic means describing the procedure and principles actually applied, so the person understands which data were used and how; that saying how far a change in the data would have changed the result can be appropriate; that handing over an algorithm is not an explanation; and that claimed trade secrets go to the authority or court to balance22.
The artefacts follow: a decision record per decision (model version, inputs, outcome, reason codes, counterfactual); a notice that a solely automated decision was taken and how to contest it; a contest path to a reviewer with authority and information to change the outcome, with a record of what they did; and a monitor of the oversight itself, because a reviewer who confirms almost every output in seconds is not meaningful involvement (the Human-in-the-loop Gate pattern).
The regimes side by side
| Regime | Trigger | Core duty or right | Artefact | Layer |
|---|---|---|---|---|
GDPR Art. 22, Art. 15(1)(h) | Solely automated decision, legal or similar effect | Narrow permission; intervention, view, contest; information on the logic 122 | Decision record; notice; contest path | 4 · 5 |
UK GDPR Arts. 22A–22D | Significant decision without meaningful human involvement | Allowed with safeguards; tighter for special-category data 23 | The same, plus why involvement is meaningful | 4 · 5 |
| CCPA ADMT regulations | ADMT for a significant decision | Pre-use notice; opt-out or human appeal; access; from 1 Jan 2027 24 | Notice; opt-out and appeal workflow; risk assessment | 2 · 4 · 5 |
| US state laws (Virginia, Colorado, Minnesota) | Profiling for decisions with legal or similar effects | Opt-out2526; in Minnesota, question the result, learn the reason, re-evaluation on corrected data 27 | Opt-out flag honoured at inference; review workflow | 1 · 4 |
LGPD Art. 20 | Decision solely by automated processing affecting interests | Review; information on criteria, respecting trade secrets 28 | Review workflow; criteria statement | 4 · 5 |
PIPL Art. 24 | Automated decision with significant impact | Transparency, fairness; explanation; refusal of solely automated decisions 5 | Explanation service; manual route | 4 |
EU AI Act Art. 86, Art. 26(11) | Deployer decision on an Annex III high-risk output | Explanation of the system’s role and main elements; informing people 2914 | Explanation keyed to the decision record | 4 · 5 |
Article 86 applies only where Union law does not already give the right29, so the GDPR route usually does the work (chapter 18 reads AI Act Article 86 and Article 4a in context). It sits outside the Annex III requirements the Omnibus deferred to 2 Dec 20272, and whether it bites earlier is not settled as of 2026-09-24 (verify). The Digital Omnibus proposal would recast Article 22 as a permission list in which contractual necessity holds even if a human could decide30; it is not law (see below).
Maps to: GDPR Art. 13(2)(f), Art. 15(1)(h), Art. 22 · UK GDPR Arts. 22A–22D · CCPA ADMT
regulations · LGPD Art. 20 · PIPL Art. 24 · EU AI Act Art. 14, Art. 26(11), Art. 86 · NIST
AI RMF (Manage) · layers 04 and 05. Mappings are illustrative, not a claim of conformity.
Data subject rights against trained models
Where a request has to reach
Rights of access, rectification, erasure and objection 1 do not stop at the database. The deadline is one month, extendable by two for complex requests31, so the path is designed before the first request. A controller that cannot identify a person in a training set may say so, and the person may supply information that makes identification possible31.
| Where the data sits | Feasible response to erasure or objection | Evidence |
|---|---|---|
| Source systems and raw corpus | Normal request tooling | Ticket closure |
| Training and fine-tuning snapshots | Remove; flag models trained on the snapshot | Snapshot diff |
| RAG index and caches | Delete or re-index chunks; immediate | Index manifest |
| Prompt and output logs | Delete or pseudonymise by subject key | Retention verdict |
| Eval sets | Replace with synthetic records | Eval-set card |
| Model weights (if not anonymous) | Suppress outputs now; retrain or unlearn on a schedule | Filter rule; retrain plan |
Suppression, retraining and unlearning
For data inside the weights there is a ladder, from fast and partial to slow and complete:
- Output suppression. A filter around the model stops it producing the person’s data. The CNIL accepts filters where retraining is disproportionate, if shown effective and robust, and prefers general rules to a list of names (itself a list of people who objected)31. The data stays in the model; test the filter like any control.
- Retraining without the data. Where the training data is still held, retraining answers the request, and periodic retraining batches many31. Complete for the new version, costly for large models.
- Machine unlearning. Exact approaches such as SISA shard training so only the affected shard is retrained32; approximate ones adjust weights and are hard to verify. Treat any unlearning claim as a test to pass (membership inference or extraction on the removed records).
Record the choice and its reason per request: the regulator will ask why suppression and not retraining, and when the next retrain closes the gap.
Recording how a request was honoured
The evidence is a fulfilment record written by the workflow: every location, the action in each, the model versions affected and when the gap closes.
Maps to: GDPR Art. 12(3), Arts. 15–17, Art. 21 · ISO/IEC 27701 · NIST AI RMF (Manage) ·
layers 04 and 05. Mappings are illustrative, not a claim of conformity.
Does a model contain personal data?
The EDPB anonymity test
If a model is personal data, rights, transfer and breach rules reach the weights. Authorities differ. The Hamburg authority’s 2024 discussion paper argued that storing a large language model is not processing, that rights attach to the system’s inputs and outputs, and that unlawful training does not taint later use33. The EDPB was stricter: models trained on personal data cannot in all cases be considered anonymous, and a model is anonymous only if both the likelihood of extracting training subjects’ data directly and the likelihood of obtaining it through queries are insignificant, given all means reasonably likely to be used3. The CNIL has since published guidance on documenting whether a model falls under the GDPR and recommends robust filters around models that may have memorised data34.
For the engineer the opinion is a test plan. Authorities will examine source selection, preparation and minimisation, training choices (regularisation, differential privacy), output measures, audits, and structured testing against attribute and membership inference, exfiltration, regurgitation, model inversion and reconstruction attacks; they expect documentation including DPIAs (or the decision not to run one), the threat model, per-source measures with source URLs, and evidence of resistance to re-identification3. That is an anonymity evidence pack, and most of it is layer 03 output: an attack suite runs as an eval gate on each model version, and its result is the claim.
Passing known attacks evidences resistance to those attacks only, as the EDPB notes3; the pack is re-run when the model, its data or the state of the art changes.
When the model was trained unlawfully
The opinion sets three scenarios3. If personal data stays in the model and the same controller deploys it, the effect of the unlawful development is assessed case by case. If another controller deploys it, that deployer should have assessed that the model was not developed unlawfully, looking at the source of the data and any infringement found by an authority or court, scaled to its own risk. If the model was anonymised before deployment and deployment processes no personal data, the GDPR does not apply to that operation; new personal data processed in deployment is assessed on its own.
The second scenario reaches most organisations, because most deploy models they did not train. In the Vendor / Model Due-Diligence Gate it becomes stored answers: the provider’s training-data summary, its stated basis, any public enforcement finding, its anonymity claim and evidence, and the date checked.
Maps to: GDPR Art. 4(1), Art. 5(2), Art. 24, Art. 25 · EU AI Act Art. 53 · NIST AI RMF
(Measure) · Adversarial Red-Team Suite · layers
02, 03 and 05. Mappings are illustrative, not a claim of conformity.
Special categories, inferred data and biometrics
Article 9(1) GDPR prohibits processing data revealing racial or ethnic origin, political opinions, religious or philosophical beliefs or trade union membership, and processing genetic data, biometric data for unique identification, health data and data on sex life or sexual orientation, unless an Article 9(2) condition applies, such as explicit consent1. The AI Act’s new Article 4a lets providers of high-risk systems process such data where strictly necessary for bias detection and correction, only if other data (including synthetic or anonymised data) would not do, with pseudonymisation, access controls, no onward transmission and deletion once the bias is corrected (chapter 16 on special-category data for bias detection (Art. 4a)); deployers and providers of other systems may do so exceptionally, and no duty to run bias work is created2. The old Article 10(5) basis was deleted35.
Inferred and proxy sensitive data
AI creates sensitive data without collecting it: health inferred from purchases, religion from meal choices, orientation from social graphs, or a postcode standing in for ethnicity. The ICO’s AI guidance treats inferences and special-category data as a lawfulness question36. Washington’s My Health My Data Act counts as consumer health data information derived or extrapolated from non-health data, including by algorithms or machine learning37. California requires a risk assessment before automated inference of health, economic situation or behaviour in certain contexts24.
Two controls make this checkable. A proxy test in layer 03 measures how well each feature and the output predict a protected attribute on a labelled set, failing the build above a threshold. An inference policy in layer 01 lists attributes a system may not infer, enforced by an output classifier in layer 04. Both leave records that the sensitive inference was looked for.
Biometrics
Biometric data results from technical processing of physical, physiological or behavioural traits that allows or confirms unique identification, such as facial images or fingerprints1. Keep three uses apart: identification (one to many), verification (one to one) and categorisation (assigning a group from traits).
| Instrument | Rule on biometrics | Artefact |
|---|---|---|
GDPR Art. 9 | Biometric data for unique identification is a special category 1 | Article 9(2) condition record; DPIA |
EU AI Act Art. 5(1)(e)–(h) | Bans untargeted facial scraping, emotion inference at work and school (medical and safety uses excepted), categorisation inferring sensitive traits, and real-time remote identification for law enforcement save narrow exceptions 38 | Prohibited-use policy as code; intake screen |
| EU AI Act Annex III point 1 | Remote identification (not verification), sensitive categorisation and emotion recognition are high-risk where lawful 39 | High-risk classification record |
Omnibus proposal Art. 9(2)(l) | Would allow verification under the person’s sole control 30 | None yet |
| Illinois BIPA | Retention schedule, informed written consent, no profiting; private action with USD 1,000 per negligent and USD 5,000 per intentional or reckless violation 40 | Consent capture; retention as code; destruction log |
PIPL Arts. 28–29 | Biometrics are sensitive: specific purpose, necessity, separate consent 5 | Separate-consent record; PIPIA |
BIPA is enforced through private class actions, and a 2024 amendment is reported to limit repeated scans of the same person to one recovery (verify)40. A leaked password can be reset; a leaked face cannot, so biometric templates get the strictest retention and access rules, and their deletion log is evidence worth keeping.
Consumer-health and neural data
Washington’s My Health My Data Act, in force for most entities since 31 Mar 2024, requires consent to collect, separate consent to share and a signed authorisation to sell, enforced through the state consumer-protection act37. Neural data (information generated by measuring nervous-system activity) is sensitive personal information under the CCPA by SB 1223, approved 28 Sep 202441, and sensitive data under the Colorado Privacy Act by HB24-1058, in force since 7 Aug 202442. An AI system reading wearables or brain-computer interfaces must flag these data classes at intake, because they switch on consent and assessment duties that ordinary telemetry does not.
Maps to: GDPR Art. 4(14), Art. 9, Art. 35(3)(b) · EU AI Act Art. 4a, Art. 5(1)(e)–(h), Annex III point 1 · BIPA · Washington MHMDA · CCPA · PIPL Arts. 28–29 · NIST AI
RMF (Map, Measure) · layers 01, 03 and 04. Mappings are illustrative, not a claim of conformity.
AI-specific privacy breaches
A personal data breach is a breach of security leading to the accidental or unlawful destruction, loss, alteration, unauthorised disclosure of, or access to, personal data1. The controller notifies the authority without undue delay and, where feasible, within 72 hours of becoming aware, unless the breach is unlikely to result in a risk; informs the people affected when the risk is high; and documents every breach1. AI adds ways to disclose data that do not look like a stolen database.
| Breach type | Mechanism | Detection | Artefact |
|---|---|---|---|
| Regurgitation and extraction | The model reproduces memorised training text, including names, phone numbers and emails 43 | Output PII hits; canaries; user reports | Output guardrail log; extraction eval |
| Membership inference | An attacker learns whether a record was in the training set 44 | Found by testing, rarely at runtime | Membership-inference eval |
| Model inversion | Features of training subjects reconstructed from outputs and confidence scores 45 | High-volume probing patterns | Rate limits; red-team result |
| Prompt-injection exfiltration | Instructions hidden in retrieved content make the assistant leak data it can read 4647 | Blocked outbound links; tool-call anomalies | Guardrail decisions; tool-call traces |
| Over-broad retrieval | A RAG index returns another customer’s records | Cross-tenant retrieval alerts | Index access tests; retrieval traces |
| Log exposure | Prompts with personal data readable in observability tools | Access reviews; DLP on log stores | Retention verdicts; access logs |
Whether a given event is notifiable is the privacy team’s judgement on the facts, with the EDPB’s worked examples as a guide48. The engineering job is to produce the facts within the clock: the trace of what left, the registry entry saying whose data the system holds, the eval history saying whether the weakness was known. For agents that read mail, browse and call tools, the AEPD’s guidance on agentic AI of 18 Feb 2026 sets out the added threats and the measures controllers can take49. One incident can start several clocks: the GDPR’s 72 hours runs beside the AI Act’s Article 73 deadlines (chapter 08) and any sector regime; chapter 17 sets GDPR breach notification next to the AI Act clocks. Give the Incident Pipeline a personal-data-breach branch with its own timer from the awareness timestamp, and keep the Omnibus proposal’s 96 hours and high-risk threshold as a parameter, not today’s rule30.
Maps to: GDPR Art. 4(12), Arts. 32–34 · EU AI Act Art. 15, Art. 73 · OWASP LLM02:2026 ·
OWASP Agentic ASI01 50 · NIST AI RMF (Manage) · layers 03, 04 and 05. Mappings are illustrative,
not a claim of conformity.
The GDPR side of the Digital Omnibus
Only one of the two Omnibus texts is law: the Digital Omnibus on AI, Regulation (EU) 2026/1744, in force since 27 Jul 2026, which created Article 4a2. The Digital Omnibus proposal of 19 Nov 2025, COM(2025) 837, would amend the GDPR and neighbouring rules30. As of 2026-09-24 it remains a proposal: the Parliament’s ITRE and LIBE committees had a draft report from 22 Jun 2026 and more than 1,750 amendments, the Council’s planned mandate vote of 26 Jun 2026 was cancelled, and by August 2026 trilogues had not begun51. Commentary on Council working texts reported that a June compromise replaced the proposed Article 88c with a recital and reworked the personal-data definition through a new pseudonymisation provision52.
| Proposed GDPR change 30 | Current law | Build now |
|---|---|---|
Art. 4(1): not personal data for an entity that cannot identify the person by means reasonably likely to be used | Recital 26; the SRB judgment 7 | Key custody records |
Art. 9(2)(k), 9(5): residual special-category data in AI development and operation; avoid, remove, or shield from outputs | No AI-specific condition | Special-category scans; output filters |
Art. 88c: legitimate interests for AI, with minimisation, protection of residual data, enhanced transparency and an unconditional right to object | Article 6(1)(f) and the three-step test 3 | LIA with an opt-out endpoint |
Art. 22: permission list; contractual necessity even if a human could decide | Current Article 22 1 | Decision records; contest paths |
Art. 33: high-risk breaches only, 96 hours, single entry point | 72 hours, any risk | A parameterised breach timer |
Art. 35: EU-wide DPIA lists, template and methodology | National lists | A DPIA mappable to a common schema |
The reading is short: do not build to a proposal. Build the controls both versions want, and make the parameters that may move (breach clock, notification threshold, DPIA triggers) configuration, not code.
Beyond the EU: UK, US, Brazil and China
United Kingdom
The Data (Use and Access) Act 2025, section 80, replaced UK GDPR Article 22 with Articles 22A to 22D: a significant decision with no meaningful human involvement is allowed with safeguards (information, representations, human intervention, contest); special-category data is limited to explicit consent, or contract or legal authorisation with the substantial-public-interest condition; and the new recognised-legitimate-interests basis cannot support such a decision23. The rules took effect on 5 Feb 202623. The ICO consulted on draft ADM guidance from 31 Mar to 29 May 202653, and marks its AI guidance as under review because of the Act36. Chapter 08 places the UK in the regulatory map.
United States
There is no federal comprehensive privacy law. California’s regulations on ADMT, risk assessments and cybersecurity audits took effect on 1 Jan 202624. Chapter 21 walks one hiring tool through Colorado SB 26-189 and the CPPA ADMT rules side by side. ADMT means technology that uses computation to replace or substantially replace human decision-making; a significant decision concerns lending, housing, education, employment or healthcare. Risk assessments are due before, among others, using ADMT for significant decisions, certain automated inferences, and training ADMT or facial-recognition technology; for processing that predates the rules they are due by 31 Dec 2027, with submissions to the agency by 1 Apr 202824. Virginia’s law shows the shape of the others in the table: opt-outs of targeted advertising, sale and significant profiling, and assessments the Attorney General can demand2554. The number of states with such laws keeps growing (verify the current count).
| Law | Profiling or ADMT right | Assessment duty | Sensitive-data note |
|---|---|---|---|
| California CCPA and ADMT regulations | Pre-use notice; opt-out or appeal; access 24 | Risk assessments, submitted to the agency 24 | Neural data is sensitive 41 |
| Virginia CDPA | Opt-out of profiling 25 | Assessments, available to the Attorney General 54 | Sensitive data triggers an assessment 54 |
| Colorado Privacy Act (2023-07-01) | Opt-out incl. profiling 26 | Assessments for heightened risk 26 | Neural and biological data are sensitive 42 |
| Minnesota CDPA (2025-07-31) | Question, reason, review, re-evaluation 27 | Not mapped in this edition | Not mapped in this edition |
The practical unit is the right, not the state: one opt-out signal honoured at inference, one reason-and-review workflow, one assessment template with fields for each state’s triggers.
Brazil and China
Brazil’s LGPD includes legitimate interests among its legal bases, sets stricter conditions for sensitive data, treats anonymised data as outside the law unless the anonymisation can be reversed with reasonable efforts, gives a right to request review of solely automated decisions with information on the criteria (subject to trade secrets), and lets the authority require an impact report28.
China’s PIPL lists its legal bases in Article 13 with no general legitimate-interests basis, so training on personal information usually rests on consent or another listed ground. Automated decisions must be transparent and fair, with a right to an explanation and to refuse solely automated decisions of significant impact; sensitive information, including biometrics, needs necessity and separate consent; cross-border provision needs a CAC security assessment, certification or the standard contract; and an impact assessment is required in advance for sensitive data, automated decisions, entrusted processing and cross-border provision, kept for at least three years5. Chapter 08 maps China’s AI-specific rules (China).
Obligation to artefact map
Layers: 1 Govern-as-Code · 2 Inventory & Transparency · 3 Evals & Red Teaming as Evidence · 4 Runtime Controls & Observability · 5 Assurance & Continuous Compliance.
| Obligation | Artefact | Layer | Duty holder | Evidence record |
|---|---|---|---|---|
GDPR Art. 5(1)(b), 6(4) purpose limitation | Purpose tags; purpose-match policy | 1 · 2 | Controller | Verdict per run |
GDPR Art. 6 lawful basis | Basis registry; versioned LIA | 2 | Controller | Registry entry with LIA ref |
GDPR Art. 7 consent | Consent-purpose log | 2 · 5 | Controller | Withdrawals traced to runs |
GDPR Arts. 13–14 transparency | Notice generated from the registry | 2 | Controller | Notice version per model version |
GDPR Art. 5(1)(c), Art. 25 | Feature justification; PII filters; retention as code | 1 · 3 | Controller | Filter logs; retention verdicts |
GDPR Art. 28 processors | AI vendor clause checklist | 2 · 5 | Controller | Gate record per change |
GDPR Art. 30 ROPA | Records generated per processing moment | 2 · 5 | Controller; processor | Generated record |
GDPR Arts. 35–36 DPIA | AI DPIA template; “no DPIA” decision | 1 · 2 | Controller | Versioned DPIA |
GDPR Arts. 44–46 transfers | Transfer register; routing policy; TIA | 1 · 4 · 5 | Controller; processor | Routing verdicts |
GDPR Art. 22, 15(1)(h) ADM | Decision record; notice; contest path | 4 · 5 | Controller; score producer | Decision and review records |
GDPR Arts. 15–17, 21 rights | Request workflow across all locations | 4 · 5 | Controller | Fulfilment record |
GDPR Art. 5(2) model anonymity | Anonymity evidence pack; privacy attack evals | 3 · 5 | Controller (developer) | Eval result per version |
GDPR Art. 9 sensitive and inferred data | Proxy test; inference policy; condition record | 1 · 3 · 4 | Controller | Proxy eval; classifier decisions |
GDPR Arts. 33–34 breaches | Breach branch of the incident pipeline | 4 · 5 | Controller; processor | Awareness timestamp; notice |
EU AI Act Art. 4a | Pseudonymised bias set; deletion job; ROPA reason | 1 · 2 | Provider; deployer (exceptionally) | Deletion log; ROPA entry |
EU AI Act Art. 26(9), 27(4) | FRIA-as-Code sharing DPIA fields | 2 | Deployer | Linked assessments |
EU AI Act Art. 86 | Explanation keyed to the decision record | 4 · 5 | Deployer | Explanation per request |
UK GDPR Arts. 22A–22D | Safeguard workflow; involvement rationale | 4 · 5 | Controller | Review records |
| CCPA ADMT regulations | Pre-use notice; opt-out or appeal; risk assessment | 2 · 4 · 5 | Business | Notice; opt-outs; assessment |
| US state profiling opt-outs | Opt-out flag at inference; assessment template | 1 · 4 · 5 | Controller | Opt-out verdicts |
| BIPA; MHMDA; neural-data laws | Consent capture; retention schedule; intake flags | 1 · 2 | Business | Consent and destruction logs |
LGPD Art. 20; PIPL Arts. 24, 55–56 | Review and explanation workflows; PIPIA | 4 · 5 | Controller; processor | Review records; PIPIA |
Maps to: GDPR Arts. 5–7, 9, 13–17, 21, 22, 25, 26, 28, 30, 32–36, 44–46 ·
UK GDPR Arts. 22A–22D · CCPA and its ADMT regulations · Virginia, Colorado and Minnesota privacy
acts · BIPA · Washington MHMDA · LGPD · PIPL · EU AI Act Arts. 4a, 5, 26, 27, 86 · ISO/IEC
42001 · ISO/IEC 27701 · NIST AI RMF (Govern, Map, Measure, Manage) · all five layers. Mappings are
illustrative, not a claim of conformity.
What you can do this week
- List the processing moments of your highest-risk AI system and write the lawful basis and retention next to each. Every blank cell is a finding.
- Add one privacy eval to the gate: a PII-leakage or membership-inference test with a threshold that fails the build. Its result is page one of an anonymity evidence pack.
- Run a mock erasure request through corpus, snapshots, RAG index, logs and weights, write the fulfilment record, and time it against the one-month deadline.
- Send your AI vendors the clause checklist (no training, prompt retention, region, sub-processors, change notice) and store the answers on their registry entries.
- Trace one inference call to the country that serves it and check the transfer register names a ground. If it does not, the residency policy has its first rule.
Sources
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