Cryptographic Message Syntax (CMS) content type Data is defined as

    Data ::= OCTET STRING

This type identified by the content information object identifier value id-data, which is defined as

    id-data ::= <OID> 1.2.840.113549.1.7.1 </OID> 

The id-data value identifies opaque information, such as ordinary text files, word processing documents, spreadsheets, biometric template information, or any other type of information whose structural details and interpretation are left to the application.

CMS-based applications may use context to determine the actual type of underlying information contained in a value of type Data, or external indications such as the results of S/MIME processing may be required to determine the actual type of the value hidden inside the octet string.