Patent ID: RE45052

Claim:
A playback device configured to play data encoded in a multimedia file, comprising: a processor configured to read the multimedia file; wherein the multimedia file has at least one video track and includes a video stream descriptor list comprising: a video stream header chunk; a video stream format chunk following said video stream header chunk; and a video stream name chunk including a string indicating a video stream in said at least one video track; said video stream descriptor list further comprising a video stream header data chunk in response to said at least one video track being a digital rights management (DRM) protected video, said video stream header data chunk following said video stream format chunk in said video stream descriptor list; said video stream header data chunk in said video stream descriptor list including a DRM information data block comprising: a first member specifying a version of the DRM; and a second member specifying a protection of the DRM said DRM information data block in said video stream header data chunk having a data structure defined as: typedef_DRMinfo { WORD wVersion; STR sDRMinfo; } DRMINFO.