What your "plagiarist" is doing is perfectly legal I think. As long as your name appears in the source code and/or binary, you can't send a DMCA takedown. Also,

What your "plagiarist" is doing is perfectly legal I think. As long as your name appears in the source code and/or binary, you can't send a DMCA takedown. Also, he is not using your name to endorse his own product, which is what point 3 of the BSD license is all about. Also, note that the plagiarist's derivative software can be under any license of his choice, be it commercial, non-commercial or personal. He is free to include / modify your source code and sell it under a different license of his choice -- the only restriction being that your name must appear in those parts of his source code you have written. Unless you buy his product and confirm that he has removed your name, you can't do anything. Remember that BSD license roughly means public domain with copyright notice preservation. That's all. It doesn't restrict anything else.