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DTLA is the Digital Transmission Licensing Administrator. The company was founded by five companies - Intel, Panasonic, Hitachi, Sony and Toshiba.
The only purpose of the DLTA is to license the DTCP content protection tech.
In 1997, the company says reps from the "motion picture, consumer electronics and information technology industries undertook an evaluation of technologies to perpetuate within the home environment protections applied to content when delivered to the home (such as encryption of prerecorded media or conditional access cable or satellite delivery systems)."
From there, DTCP was born, and there are now 130 licensees worldwide including TV manufacturers, Cable and satellite box manufacturers, Media Players and Recorders, Chip manufacturers and Home Media Servers and Adapters.
More info on DTCP from our glossary entry: AfterDawn DTCP entry