Options for Metadata Binding
Last updated
Last updated
When it comes to managing opt-out declarations for TDM in a machine-readable way, in principle, two different approaches are discussed:
Location or domain-based metadata binding: rightsholder preferences for web-published content are included in robots.txt-file or in HTML/HTTP metadata of the domain, e.g. Robots.txt, TDMrep;
Asset-Based metadata binding: metadata is embedded directly into the media file, e.g. C2PA.org (Hard-Binding) or metadata is provided in an external (sidecar) file and linked to the ISCC code (Soft-Binding)
Embedded metadata is removed from the media file.
Content is altered or manipulated, compressed or converted into a different file format – and the method is based on cryptographic hashing.
When content is already distributed, shared and part of training sets, metadata cannot be embedded.
Content is shared on websites beyond the rightsholder's control, e.g. on social media, so a domain-based approach cannot be applied.
A lot of content is not publicly accessible on web domains.
Watermarks or steganographic data can be removed from media files.
