A proactive intellectual property enforcement system is disclosed. File sharing services may be disrupted by uploading a collection of multiple modified versions of a media file. The collection of modified copies may each include a distinct portion of modified and unmodified content. However, even though each modified copy includes a distinct variation of modified and unmodified content, the set of modified files are constructed such that some common portion (or portions) of the media file are always created as the modified version. Thus, a complete, unmodified copy of the media title cannot be reconstructed from the set of modified copies.