Sign your content
Digitally sign your work with your own certificate or verifiable credential, binding it to your identity and the rights you declare. The signature is timestamped and can be verified by anyone.
Features
Sign, protect, and declare your original work – verifiably
With Liccium, you digitally sign your content, bind your rights and metadata to it, and publish a declaration that third parties – platforms, AI systems, anyone – can discover and verify. Your files stay with you; only the declaration is public.
Capabilities
What Liccium does
Rights and metadata binding
Your rights and metadata are inseparably bound to the content’s fingerprint and travel with it in the declaration, so third parties – platforms, AI systems, registries – can discover and access them.
Content fingerprint (ISO 24138)
Liccium generates a content fingerprint for images, text, audio, and video. It is derived from the content itself, so the work can still be matched after copies, edits, and re-encodes.
Machine-readable AI preferences
State whether your content may or may not be used for AI training and text-and-data-mining – opt out, attach a licence, or flag AI involvement with FAIA – in a form crawlers and AI systems read directly.
Verified identity
Attach a verifiable identity to your declarations, or declare pseudonymously – using certificates or verifiable creator credentials.
Deduplication and content matching
Find exact copies and near-duplicates across your library or the web.
Declare web content
Timestamp and declare web pages and images. Provide a URL and Liccium fingerprints the content directly.
Automatic declarations
Link your Bluesky account and Liccium declares each tagged post automatically, running on Liccium’s servers so it works when your computer is off.
Update or withdraw over time
Update rights and metadata after publication, or withdraw a declaration. Your signed history stays valid.
Plugins
You choose what to declare
You decide which rights and metadata to declare publicly, per file.
Rights and reservations
TDMRep
State whether your content may be used for text-and-data-mining and AI training, in machine-readable form (W3C TDM Reservation Protocol).
Creative Commons
Attach a Creative Commons licence stating what others may and may not do with the work.
Sector metadata
IPTC
The photo-industry fields agencies and publishers expect: creator, credit, copyright, keywords, licence.
Text
Bibliographic metadata for written works: authors, title, publisher, ISBN, DOI.
Audio
Release metadata for audio: artist, album, and industry IDs (ISRC, ISWC, ISNI).
Trust and provenance
FAIA
Flag whether and how AI was involved: Human-Created, AI-Assisted, or AI-Generated.
C2PA
Attach a tamper-evident Content Credential that C2PA-aware tools (Photoshop, Firefly) can read, bound to the content by its fingerprint and stored in a sidecar, so the original file is unchanged.
How it works
Fingerprint content, bind metadata, declare
Fingerprint
Liccium generates the content fingerprint for your work.
Bind
Attach your rights and metadata, inseparably, to that fingerprint.
Declare
Sign and publish a verifiable declaration to the public registries.
Join the waiting list
Be one of the first to use Liccium Desktop.