Ultimate Media Player violates the GPL license:
http://www.ultimatemediaplayer.net


Content of their install:
 Directory of C:\Program Files (x86)\Ultimate Media Player

08-04-2011  09:39    <DIR>          .
08-04-2011  09:39    <DIR>          ..
08-04-2011  09:39    <DIR>          3rdParty
08-04-2011  09:39    <DIR>          LibAV
10-03-2011  18:13           107.834 UMP EULA.rtf
16-03-2011  19:58         2.150.912 UMPlayer.exe
08-04-2011  09:39             4.410 unins000.dat
08-04-2011  09:38           714.526 unins000.exe
               4 File(s)      2.977.682 bytes

 Directory of C:\Program Files (x86)\Ultimate Media Player\3rdParty

08-04-2011  09:39    <DIR>          .
08-04-2011  09:39    <DIR>          ..
29-01-2011  14:49            27.032 FFMpeg-License.txt
29-01-2011  14:49            25.284 LAME-License.txt
29-01-2011  14:49             1.450 LibGSM-License.txt
29-01-2011  14:49             1.466 LibOGG-License.txt
29-01-2011  14:49            10.271 LibOpencoreAMR-License.txt
29-01-2011  14:49            24.390 LibSDL-License.txt
29-01-2011  14:49             1.470 LibTheora-License.txt
29-01-2011  14:49             1.470 LibVorbis-License.txt
29-01-2011  14:49             1.496 LibVPX-License.txt
               9 File(s)         94.329 bytes

 Directory of C:\Program Files (x86)\Ultimate Media Player\LibAV

08-04-2011  09:39    <DIR>          .
08-04-2011  09:39    <DIR>          ..
29-01-2011  14:49         9.825.792 avcodec-52.dll
29-01-2011  14:49            56.832 avcore-0.dll
29-01-2011  14:49            16.384 avdevice-52.dll
29-01-2011  14:49           112.640 avfilter-1.dll
29-01-2011  14:49           920.064 avformat-52.dll
29-01-2011  14:49           121.344 avutil-50.dll
29-01-2011  14:49           321.536 SDL.dll
29-01-2011  14:49           222.720 swscale-0.dll
               8 File(s)     11.597.312 bytes


The FFMpeg-License.txt file contains the LGPL license text, but the actually
use a GPL version:

[~/LibAV]$ strings avcodec-52.dll |grep -i gpl
j--prefix=/ffmpeg/Binaries --disable-debug --disable-static --enable-shared
--enable-version3 --enable-avfilter --enable-memalign-hack --enable-avisynth
--enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libvpx --target-os=mingw32 --extra-cflags=-I/extlib/
include --extra-ldflags=-L/extlib/lib --enable-libmp3lame --enable-libtheora
--enable-libvorbis --enable-gpl --enable-libx264 --enable-libxvid
--enable-libfaad --enable-nonfree --enable-libfaac
This software is derived from the GNU GPL XviD codec (1.1.0).

Their web site has a page claiming to provide source code. It claims they
use the LGPL version (lie), and the linked archive only contains binaries,
not source code:
http://www.ultimatemediaplayer.net/source.html
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