9. Is there any DRM implementations? Give examples

Examples: a) Adobe Systems(.PDF can restrict document printing): "... a publisher might give users the ability to print several pages of a cookbook within a set period of time."

b) iTunes (which incorporates Apple's FairPlay DRM for content downloaded through the iTunes Music Store).

c) Windows Media DRM (WMDRM) which protects Windows Media Audio or Windows Media Video content and is implemented in Windows Media Player.

d) OpenIPMP is an open standard DRM for protection of MPEG-4; it is available as open source.

e) Sony has announced their own DRM protected music store named Connect, using their DRM technology OpenMG. OpenMG supports the Sony ATRAC sound format.