In my opinion CSS is confuse, can be the style language. You can say Content
Scramble System (CSS) or Digital Restrictions Management (DRM).
Remember: the format isn't proprietary. Is encumbered by patents. [3] And
free software (VLC, Gstreamer [Totem, Rhythmbox], MPlayer, etc) can play
formats encumbered by patents.
[1] http://en.wikipedia.org/wiki/Content_Scramble_System
[2] http://en.wikipedia.org/wiki/Digital_rights_management#Opposition_to_DRM
[3] http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Patent_licensing
