most of them will ignore you. it usually takes lawyers to make stuff like that happen. reference the case of napster. the thing with most file share programs is that there isn't one, physical server that the files reside on, but instead, a copy of the file resides on every computer that has downloaded the file, and can be accessed by any other computer that does a search through the file systems of every other computer that is currently running the file share software. So, you don't have the option of going to a server and having that file removed from that server, and suddenly no one else can access it. Instead it would have to be removed from every computer that is connected through the software. Now, the programmers of the file share software can put blocks on certain file names, or file types, so that whenever the software does a search, any files of that name or type won't show up. but in a lot of cases a file is renamed various different names, so for that method to be really effective, they'd have to block all the various names that the file COULD be named, which is virtually impossible to do. At least as far as I understand. Ligitimate file sharing programs require a membership fee, and have a much more limited selection of files and file types. The member fees go toward paying royalties to the artists/musicians, etc. (or at least they're suppose to). But they also have a bit different setup, where the users connect to a database or server to receive the files.