TIFF Tag OriginalRawFileData
|Code||50828 (hex 0xC68C)|
Used in IFD 0 of DNG files.
If the DNG file was converted from a non-DNG raw file, then this tag contains the compressed contents of that original raw file.
The DNG specification defines how this tag value consist of different data forks that are split into blocks of 64 kilobyte before ZIP compression.