Think of it this way: There's a default licence (absent an explicit licence statement) that is implicit in copyright law. Copyright law grants to lawful recipients the right to compile and the right to use -- but not the right to create derivative works or redistribute.[1]
Do you say the law prevents me from taking a legal copy of a copyrighted work, which is a program, and privately modifying that program for my own use? Wouldn't that be a bit like owning a legal copy of copyrighted music, but not having the right to change any of the notes? Or buying a magazine but having the right to remove any of the pages or to add it to a scrapbook? Is software treated specially in copyright law? Surprised, Stephen North -- license-discuss archive is at http://crynwr.com/cgi-bin/ezmlm-cgi?3