MSCXXXX: Data Protection Officer contact in /.well-known/matrix/support

proposals/XXXX-dpo-role.md

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+# MSCXXXX: Data Protection Officer contact in `/.well-known/matrix/support`
+
+[GDPR] Article 37 Nr. 1 requires data controllers and processors to designate a
+Data Protection Officer (DPO). Furthermore, Article 37 Nr. 7 requires that the
+DPO's contact details be publicised. This is most commonly done via the
+privacy policy document.
+
+In Matrix, a homeserver's privacy policy is currently only made accessible via
+APIs during [account registration]. This prevents clients from easily displaying
+the contact information at later times and adds to the user's burden in finding
+them.
+
+Additionally, homeservers themselves can have a similar need to get in touch
+with another server's DPO, for instance to inform them about requests for
+erasure as required by [GDPR] Article 17 Nr. 2.
+
+While a server's support document under [/.well-known/matrix/support] can expose
+an "admin" contact, this might not be specific enough for the purposes outlined
+above – especially since server administrators and data protection officers are
+usually different roles in companies.
+
+The present proposal attempts to address these problems by exposing a dedicated
+DPO contact in the server's support document.
+
+## Proposal
+
+A new role `m.role.dpo` is introduced for `Contact`s in
+[/.well-known/matrix/support]
+
+    {
+      "contacts": [
+        {
+          "email_address": "dpo@pizza.org",
+          "matrix_id": "@dpo:pizza.org",
+          "role": "m.role.dpo"
+        },
+        ...
+      ],
+      "support_page": "https://www.pizza.org/support"
+    }
+
+Servers are *not* required to provide an `m.role.dpo` contact.
+
+## Potential issues
+
+The DPO contact details being duplicated in two places introduces the
+possibility that they get out of sync. Given that these contacts should rarely
+change, this seems like a small problem, however.
+
+## Alternatives
+
+Rather than exposing the DPO's contact details, the support document could
+publish the privacy policy URL. This could also be considered an additional
+feature rather than a replacement, however.
+
+## Security considerations
+
+None.
+
+## Unstable prefix
+
+While this proposal is unstable, `m.role.dpo` should be referred to as
+`org.matrix.mscXXXX.role.dpo`.
+
+## Dependencies
+
+None.
+
+  [GDPR]: https://eur-lex.europa.eu/eli/reg/2016/679/oj/eng
+  [account registration]: https://spec.matrix.org/v1.13/client-server-api/#terms-of-service-at-registration
+  [/.well-known/matrix/support]: https://spec.matrix.org/v1.13/client-server-api/#getwell-knownmatrixsupport