Here you find mostly 3rd party background information.
Links
Annotation Transcriber Introduction (166KB)
Arte STL EBU Proposal (100KB)
STL EBU Standard (218KB)
Closed Captioning Standards and Protocol for Canadian English Language Broadcasters (760KB)
Gilles Dubuc - Multimedia and it's application to song lyrics (MPEG-7 LML) (975KB)