The Italian ISBN agency

At the point of requesting the ISBN, publishers and authors can also file a rights declaration for their content. See here.

mEDRA DOI Registration Agency

Add a rights declaration and have it linked to your DOI through multiple and rights-aware resolution, metadata and content negotiation (coming up).

Safe Creative copyright registration agency

When registering the copyright of your work with Safe Creative, you can provide persistent identification to copyright registration records through ARDI. See here.