2.1.12 Information Rights Management Data Space Storage
The Information Rights Management Data Space storage is an optional storage whose name MUST be "\006DataSpaces", where \006 is the character with value 0x0006, and not the string literal "\006". This storage is specified in [MS-OFFCRYPTO] section 2.2.
If this storage is present, the Protected Content Stream MUST also be present.
If this storage is present, all specified streams and storages other than this storage and the Protected Content Stream SHOULD<5> be read from the Protected Content Stream as specified in [MS-OFFCRYPTO] section 1.3.2 and if any of those streams and storages exist outside of the Protected Content Stream, they SHOULD<6> be ignored.