There is no way to prevent someone misappropriating your work. Also, someone may use your work and you never know about it. Let's say I decide to practice my mad producer of tracks skills (not) and decide to take a snippet of a Kendrick Lamar recording and use it just for my own personal reasons. No one will ever know because there will have been no commercial release to track that. And even though it is an infringement that I could be sued for, if it doesn't get released then you just won't know about it. And someone in another country could steal your work and release it and you may never know about it either, unless it because a hit in the U.S. and you hear it. But don't despair, I'll give you some information on how they still might get caught.