Erica asked a great question regarding information found on my post entitled "World Wide Web." She wanted to know how to determine whether copyright is abandoned for Internet materials. The best answer that I can find based on my research thus far consists of the following:
How long does copyright last?
-Works created on or after Jan 1978, life of author + 70
-Work for hire 95 years
Basically you will need to do extensive research to find out the status of the copyright. The following two web sites may be helpful in determining the status of copyright for a specific piece of work.
This website will help determine the status of a copyright.
This website will help with the status of things registered before 1978.