“Compile millions of links to old (but still copyrighted) works, with a countdown field (in days) until they enter in the public domain…”

Sounds a bit like:

“ARROW infrastructure allows streamlining the process of identification of authors, publishers and other rightholders of a work, including whether it is orphan, in or out of copyright or if it is still commercially available…”

http://www.arrow-net.eu/presenting-arrow-system

Michael