The US governmant is having a discussion on "orphan works" or abandon-ware. Which is works (not just software) where the copyright owner is difficult or impossible to trace.
This applys a lot in the Amiga world where a lot of existing software companies have long since ceased to exist. If assets are not sold at closing down auctions who owns them?
The EFF have put a website up about this here where you can give your comments to the US Copyright Office.
http://www.orphanworks.org/