[computer-go] How to prevent Copyright violations?

[Chrilly]

I got a mail from Fritz Reul, the programmer of the strong chess programm 
Loop. Loop is sold over the internet, has a copyright protection, but Fritz 
detected, that one can download the programm from

http://www.4shared.com/file/3725942/cfa829f7/loop1032f.html

Has anyone from the professionals in the group experience with this 
question?. How can one prevent technically and legally such copyrights 
violations.
Fritz asked me, because I am an old Hacker. But I have never played around 
with such questions. I am a hacker and no gangster.

In case you do not want do discuss such points in an open maillist, please 
contact me directly under c.donninger at wavenet.at.

Chrilly