Questions about the GPL seem to come and go in waves, and lately there’s been a lot of chatter about the usefulness (or the harm) of GPLd code.
Jacob Kaplan-Moss has twenty good and hard questions about the GPL, some of which may have no answer without a courtroom decision:
foo.js is a JavaScript library released under the GPLv3. bar.js is a library with all rights reserved. For performance reasons, I would like to minimize all my site’s JavaScript into a single compressed file called foobar.js. If I distribute this file, must I also distribute bar.js under the GPL?