DNG camera profile
DNG camera profile is (1) a collective name for the various TIFF tags used for color profile information in a DNG file, and (2) a specialized file format which stores just those tags. We'll call the file format DCP.
A DNG file may have profile data integrated into the first IFD. Starting with DNG v188.8.131.52, DCP format may be used for additional embedded profiles, pointed to by TIFF tag 50933 (ExtraCameraProfiles). DCP format can also appear by itself in a .dcp file.
DCP format is TIFF-like, but with a different file signature.
DCP format begins with
'M' 'M' 0x43 0x52, or
'I' 'I' 0x52 0x43. This is the case even when it is embedded in a DNG file.
See DNG for other versions of the specification.