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Extracting the Information Unique Identifier is a similar process, it's one of the properties of the <WORK> mark:

ICE protected files

ICE uses HTML to encapsulate encrypted files and ICT tag is available on the initial comment:

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Non-RMS protected PDF files

Classification is stored in document info dictionary (DID) and can be obtained from /RightsWATCHMark at the end of the PDF file:

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The classification level is encoded using base64 which is trivial to decode, eg:


  • this only applies to public (non-encrypted) files, meaning only a few levels need to be handled this way;
  • the Unique Information Identifier for public files is always the same (00000000-0000-0000-0000-000000000000), meaning the tag has exactly the same value for any file classified with the same level.

Non-RMS protected image files

Part of image metadata for TIFF, PNG, JPEG and GIF files. Windows Explorer does provide mechanisms to access it.

Automated way to get classification