I found an interesting discussion of copywrite on the Internet by Richard Stallman
 (of GNU fame/notoriety).  Although the model he's using is music (specifically,
 the issue of DAT taping) it's equally pertinent to game software.

 It's too big to send out to everyone; but if you're interested, just look at
 EE$USERDISK:[LIPSON]STALLMAN.DOC