“I realize the BSD allows people to sell my binaries and source but I do not believe it authorizes them to sell the source under a different license.” Er, that's the exact point of the BSD license. The GPL even allows selling binaries and source code, but not re-licensing. So the gist of this blog post is that you offered your source code under a license that allows re-licensing provided that your copyright and some…
It may not be the case for this library (given that he didn't need to under this licence) but it does suggest its possible.