This plug in is violating the GPL license

Your plugin claims to be licensed under GPLv2 or later. Yet it only provides a minified version of your flip book plug in.

The terms of the GNU GPL require that the source code for an executable be made available in one of the ways the GPL permits. If the Javascript or CSS is minified or obfuscated the GPL would require that the corresponding source code be made available. This is also very useful in cases where multiple Javascript libraries are being served minified and concatenated into a single document.

FSF has written a guide to releasing your Javascript as free software, available here: https://www.gnu.org/software/librejs/free-your-javascript.html

Please provide full source code to your plug in or remove it from the WordPress directory. You are abusing the terms of the FSF in order to sell licenses.