eyedia
A research portal under two rulebooks
One hospital, one research policy, two sets of device rules: which research sessions may go ahead, and what would change?
research-portal.pl · output · proof · check · try it in the playground
The situation
A hospital runs a portal through which partners in a research consortium use patients’ lab results: sensitive health data.
Two different questions decide whether a planned session may go ahead:
- Does the hospital’s research policy allow this use of the data?
- The portal page also places a cookie or tracker on the visitor’s device. Is that allowed, and does it need the visitor’s consent?
The second question is about to get new rules: the European Commission’s Digital Omnibus proposal (19 November 2025) would change them. So we ask both questions twice: under the rules today and under the proposal.
The whole decision on one page
Each session passes two gates, in order. A “no” at the first gate ends it, whatever the device rules say. The picture already shows every result; the rest of this deck explains why.
Gate 1: the hospital’s research policy
The policy is written in ODRL, the W3C language for machine-readable “who may do what with which data” rules, using terms from DPV, the Data Privacy Vocabulary. In plain words, consortium partners may use the lab results for research, only with the patient’s consent, only pseudonymised (names replaced by codes), and only before 2027. Two things are forbidden outright: passing the data on for marketing, and any use by the US partner.
process('ex:r1', 'ex:hospital', 'ex:partnerBE', 'dpv:Use', 'ex:labResults',
'dpv:AcademicResearch', 'dpv:Consent', 'dpv:ConsentGiven',
'dpv:Pseudonymisation', 20261115).
This is session r1: for the hospital, the data controller, the Belgian partner wants to use the lab results for academic research, on consent, pseudonymised, on 15 November 2026. DPV knows that academic research is research, so the purpose fits.
The policy is data the program reads, not a comment: it governs r1 because
it is an ODRL agreement assigned by r1’s data controller. Delete any one of
its 26 triples and the outcome changes; eyedia --unused checks exactly that.
Gate 2: the device rules, today and proposed
| Today (ePrivacy Directive) | Proposal (new GDPR Art. 88a–b) | |
|---|---|---|
| The portal’s own visitor statistics | consent needed | no consent needed |
| The visitor’s browser says “no tracking” | not binding | must be respected |
| The visitor refused earlier | may ask again | not again within 6 months |
| Strictly needed to run the requested service | no consent needed | no consent needed |
The device question is separate from the research question. A tracker that needs no consent does not stand in for the patient’s consent to research.
The eleven sessions
| Session | What is special about it | Today | Proposal |
|---|---|---|---|
| r1 | valid research; the portal’s own statistics | wait for consent | go ahead |
| r2 | personalised advertising, on legitimate interest, not consent | refused | refused |
| r3 | passing the data on for advertising | refused (forbidden) | refused (forbidden) |
| r4 | the patient withdrew consent | refused | refused |
| r5 | encrypted, not pseudonymised; after 2026 | refused | refused |
| r6 | the US partner | refused (forbidden) | refused (forbidden) |
| r7 | valid research; ad tracker; browser says no | wait for consent | blocked |
| r8 | valid research; ad tracker; refused 5 months ago | wait for consent | blocked |
| r9 | valid research; ad tracker; refused 6 months ago | wait for consent | wait for consent |
| r10 | valid research; only what the service needs | go ahead | go ahead |
| r11 | passing the data to a partner, for research | refused (no permission) | refused (no permission) |
“Wait for consent” means: ask first, and do nothing until the visitor agrees.
What the proposal changes
changed(session('ex:r1'), from(await_device_consent('ex:research')), to(permit('ex:research'))).
changed(session('ex:r7'), from(await_device_consent('ex:research')), to(deny_device(refused_by_signal))).
changed(session('ex:r8'), from(await_device_consent('ex:research')), to(deny_device(do_not_ask_again))).
- r1 may now go ahead: the portal’s own statistics need no consent.
- r7 is blocked: the browser’s “no” now has to be respected.
- r8 is blocked: the visitor said no five months ago, too recently to ask.
Just as telling: r4 uses the same statistics as r1, but stays refused, because the patient withdrew consent to research. Easier device rules cannot fix that. And r11 shows how precise the policy is: the marketing ban does not catch sharing for research, but nothing permits that sharing either.
Data breaches: a separate duty
The hospital already holds data, so it also plans what to do if that data leaks. Here too the proposal changes the rules:
| What leaked (assessed risk) | Tell the regulator: today | Tell the regulator: proposal | Tell the patients |
|---|---|---|---|
| encrypted laptop, key safe (unlikely) | no | no | no |
| researchers’ contact addresses (some) | within 72 hours | no | no |
| patients’ lab records (high) | within 72 hours | within 96 hours, via one EU entry point | without undue delay, in both |
Every breach is recorded internally, even when nobody must be told.
Why: the proof in plain words
Take r1 under the proposal. The proof records, step by step:
- r1’s purpose, academic research, falls under research (DPV).
- Each of the policy’s five conditions holds for r1, and no prohibition applies, so the policy permits r1.
- r1’s tracker is the portal’s own statistics; under the proposal that needs no consent: GDPR Art. 88a(3)(c).
- So r1 may go ahead, with the policy’s duty to delete within 90 days.
Every step names the program line it used, and every result carries the articles it rests on.
Checked, not just claimed
A separate checker read all 273 steps: 225 were matched to a program line, and 15 calculations were redone and agreed. Verdict: checked_with_obligations.
The 33 obligations are statements of the form “there is no prohibition for this session” or “no condition failed”. Eyedia found these by searching everything it knows; the checker records them rather than proving them, and found nothing in the proof that contradicts them.
What the certificate does not show: that the rules are legally correct, that consent was really given, or that the data was really deleted. It shows that the conclusions follow from these rules and these facts.
Try it
node bin/eyedia.js examples/research-portal.pl
node bin/eyedia.js --goal "policy_result('ex:r4', Result)" examples/research-portal.pl
Or open it in the playground. Two experiments, one at each gate:
- give r4 consent again (
'dpv:ConsentWithdrawn'→'dpv:ConsentGiven'): it now passes gate 1, and the proposal lets it go ahead; - change r7’s tracker to
requested_service: gate 2 no longer needs consent, so r7 goes ahead under both rulebooks.
Takeaway
When rules change, the question is never just “is this allowed?” but “what changes, for whom, and why?” Here every answer is traced to a policy condition or an article, and a machine has checked the reasoning.
Sources and assumptions
ODRL 2.2 · DPV 2.3 · the Commission proposal, COM(2025) 837 · ePrivacy Directive Art. 5(3) · GDPR Arts. 33–34
The proposal is under negotiation, not law; it is modelled as if its provisions applied, without later amendments, national exceptions or transition dates. The portal is not a media service. Whether a tracker is strictly necessary, aggregated or for the portal’s own use, how many months ago a visitor refused, and the risk of a breach are given as inputs.