Participants
Resources
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The CEMR (Commons European Moderation Relay) is an open infrastructure initiative that enables DSA-compliant content moderation for decentralized social networking — specifically for the ATProto ecosystem, including platforms like Bluesky. It offers a transparent, modular solution to support small PDS (Personal Data Server) operators and AppView developers with label-based moderation, geo-specific filtering, and legal safeguards, without centralizing power.
- Subscribes to ATProto Jetstream (via Relay or directly)
- Parses content from posts, profiles, and feeds
- Applies automated moderation labels (e.g., CSAM, hate speech)
- Emits signed labels via
com.atproto.label.* feed
- Public, signed stream of labels and explanations
- Consumers (AppViews or PDSes) can choose to trust labels
- Supports audits, appeals, and shared governance
- Middleware that sits in front of a PDS
- Filters or blocks access to content based on:
- User location (e.g., geo-IP)
- Label types (e.g., block CSAM globally, hate speech in Germany)
- Optional: notice display, appeals redirect, transparency log
- AppViews can subscribe to CEMR's label stream
- Use labels to:
- Filter or downrank content in feeds
- Blur or warn on sensitive content
- Comply with national laws or platform rules
| DSA Requirement |
Handled By |
| Illegal content takedown |
✅ PDS Filter auto-filters (e.g., CSAM) |
| Moderation policy transparency |
✅ Public CEMR moderation policy |
| Country-specific restrictions |
✅ Geo-IP-based enforcement via proxy |
| User reporting & appeals |
⚠️ Can be delegated to CEMR or locally added |
| Moderation traceability |
✅ All labels are signed and auditable |
https://www.icloud.com/iclouddrive/05bpmHdNBq-ln-iMuesVKNnuw#CEMR
graph TD
A[PDS] -->|Pushes to| B[Relay]
B[Relay] --> I[Jetstream]
I --> one
subgraph one [CEMR Labeling Services]
C[CEMR UK]
J[CEMR DE]
K[CEMR FR]
L[...]
end
one -->|Signed Labels| D[AppViews]
one -->|Signed Labels| E[PDS Proxy]
one --> |Signed Labels| E[PDS Proxy]
F[User Request: Turkey] --> E
G[User Request: Germany] --> E
E -->|Blocked due to local label | F
E -->|Allowed, content served| G
E -->|Filtered or allowed| A
D -->|Label-based feed filtering| H[Client AppView UI]