Arnold Krille wrote:
  If you didn't sign a contract and work on a
project, the
 copyright is still yours 
 Are you sure? I guess (and I'm not sure) that if you
did some kind of
 work, e.g. being a developer for a company, it implies that the employer
 will take on the copyright and that you aren't allowed to disclose
 know-how, even if there isn't a special contract saying this. If I'm
 wrong, this  would give me some thrilling views for my future, because
 of my past and especially a friend could benefit from this, because he
 did much more for other people than I did. 
 Just because you work for a company or
contribute code to a company
 doesn't give them exclusive license to your code.
 You have to *explicitly* sign or give that right away.