Skip to main content
Encypher Logo

ODT content provenance

Content provenanceContent provenance: The record of where a piece of content came from and how it changed, carried with the content itself. for ODT files is a signed C2PA manifestC2PA manifest: The signed label itself: a small package inside a file that records who signed it, what they declared and how to check it. inside the file. Anyone can check who signed it and whether it changed, for free.

Start signing freeCheck a ODT file
A file holds a signed label in four layers: who signed it, what they declared including AI use, a fingerprint of the content, and a signature that seals them together.
The label sits inside the file. It names the signer, carries what they declared, fingerprints the content, and is sealed by a signature.
File
.odt, MIME typeMIME type: The standard name for a file format, such as image/jpeg or audio/wav, that software uses to decide how to read a file. application/vnd.oasis.opendocument.text
Where the label sits
Inside the file, in its own entry inside the ZIP package that holds the document.
Standard
C2PAC2PA: The Coalition for Content Provenance and Authenticity: the group that publishes the open standard for content labels., the open standard for content labels.
Made for
Government documents, Open-source office tools, Cross-platform documents

What Encypher supports for ODT

  • SignSupported

    Encypher signs ODT files under C2PA 2.2 and 2.4.

  • CheckSupported

    Free in the browser checker, with no account.

  • Formal conformanceNot yet

    Not in our formal conformance record. That record is a narrower test than signing and checking.

How to check a ODT file

  1. Open the free checker.

    It runs in your browser. No account needed.

    Open the checker

  2. Add your ODT file.

    Drop it in or pick it from your device.

  3. Read the result.

    It shows who signed and what they declared, such as AI use. It also shows if the file changed.

Where the label sits in a ODT file

The file is a ZIP package of entries. The label is one entry of its own.

In a DOCX, EPUB, ODT or OXPS package, the label is one entry among the files inside the package.
A ODT file keeps the label in its own entry inside the ZIP package that holds the document.

ODT is the OpenDocument text format. Public bodies and open-source office tools use it, including many EU institutions.

What keeps the label on a ODT file

Four of the five answers a provenance check can give: Verified, Modified after signing, Issuer not recognized, and No provenance found. The fifth is Could not verify.
A check reports who signed and whether the content changed. It never says whether the content is true.
  • Sending and saving the file keep the label.
  • Changing the text after signing shows as a change.
  • Printing, scanning or exporting to another format makes a new file without the label.

For engineers

Show the technical detail
Embedding
JUMBF manifest store in the META-INF/content_credential.c2pa entry of the ODF ZIP package
Accepted MIME types
application/vnd.oasis.opendocument.text
Signing versions
C2PA 2.2, 2.4
Verification
Any version. The checker reads any C2PA manifest it can parse, and the report names the version it checked against.
curl -X POST https://api.encypher.com/api/v1/sign/media \
  -H "Authorization: Bearer $ENCYPHER_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -F "file=@example.odt" \
  -F "title=My ODT file" \
  -F "action=c2pa.created"

Support rows come from the live API capability matrix. Full reference: C2PA media types.

Keep reading

Create. Mark. Endure.

Sign your first ODT file free. Checking stays free for everyone.

Start signing freeCheck a file