http://www.rfc-editor.org/rfc/rfc4078.txt
RFC 4078: The TV-Anytime Content Reference Identifier (CRID), N. Earnshaw, S. Aoki, A. Ashley, W. Kameyama2005-05-01T23:00:00-00:00This document reproduces the \%TV-Anytime CRID definition found in the \%TV-Anytime content referencing specification, and is published as an RFC for ease of access and registration with the Internet Assigned Numbers Authority (IANA). This memo provides information for the Internet community.