file extension DCF

File extension DCF description:

The DRM Content Format is closely related to the Rights Expression Language specification, which defines the syntax and semantics for the Rights Objects.
In addition to encrypting the Media Object the DRM Content Format supports metadata such as:

• - Original content type of the media object
• - Unique identifier for this DRM protected Media Object to associate it with rights
• - Information about the encryption details
• - Information about the rights issuing service for this DRM protected media object
• - Extensions and other media type dependent metadata

The file format is extensible, so additional features may be added in the future while maintaining compatibility with the older versions. Compatibility with the version 1 Content Format is not maintained by this specification, therefore a different MIME type is used.

There are two profiles of the DRM Content Format. One is used for Discrete Media (such as still images) and one for Continuous Media (such as music or video). The profiles share some data structures. Both profiles are based on a widely accepted and deployed standard format, the ISO Base Media File format, but the Discrete Media profile is meant to be an all-purpose format, not aiming for full compatibility with ISO media files.
The Content Issuer can decide which profile to use for their content, but in general, the profile for Continuous Media should be used for Continuous Media content, in order to create a harmonious user experience. The Discrete Media profile should be used for other types of content. To a User, the difference is that a file conforming to the Discrete Media profile looks like a DRM protected file, whereas a file conforming to the Continuous Media profile looks and functions like a media file to the outside.

Used in some types of cell phones.