DCF files are audio files that are encoded with Digital Rights Management copy protection. As of 2015, this file format is used in cellphones to protect any copy-protected media files they contain. This file type can only be opened by authorized, DRM-compatible phones.
Media files that can be found in the DCF format include ringtone music, videos and pictures. The information required to open a DCF file is generally located in a separate file.
The DCF file format is also used by a security software called DisCryptor. This program is used for file encryption, file security keys and data shredding.