Hi Dave;
Here is the current and COMPLETE listing of all the copyright classifications, as of March, 2004. There are over 20 different classifications but this list summarizes them all into a brief sentence or two with specific reference to dates, published or unpublished works etc. It is VERY useful. Anyone should be able to put the material in question, into one of these categories. The Internet is a minefield of copyright infringements. And the laws are clear and specific. So is this list. Ignorance is no excuse. Anyone who publishes or sells material done by others, had best consider this listing.
It is NOT all gloom & doom, though. It clearly lists when and how various classes of material falls into the Public Domain, too.
http://www.copyright.cornell.edu/training/...blic_Domain.htm