DeadSea queries: "When you find that somebody is violating the GPL by distributing your code or a derivative of your code as a closed source product, how do you go about handling it? I have found two violations of the GPL for my Java Utilities, in the last month. The Free Software Foundation says that the copyright holder is the only person empowered to act. If you are the copyright holder, how do you communicate with the offenders? I know folks here must have dealt with this before: Linksys, SCO, Castle Technology, United Linux, and others. Personally, I would like to believe that with a little nudging (and without lawyers), I can resolve the things. As such, I would especially appreciate any example letters or other documents that might be effective."