I wasn't aware of any violations. Regardless, PotPlayer just seems much better than VLC. And this is coming from someone who used VLC exclusively for many years.
In any case, this bit can be found in the Copyrights Tab of the About section:
"- This program contains the video decoder FFmpeg (http://ffmpeg.mplayerhq.hu) was used, FFmpeg subject to the LGPL license. LGPL license, refer to the installation directory LGPL.TXT. The modified FFmpeg sources can be downloaded from the http://potplayer.daum.net/devel/ffmpeg.zip."
I don't know if that resolves the situation though.
http://en.wikipedia.org/wiki/PotPlayer