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Sonic's US Patent 6,944,621 for dynamic content revision has been deemed essential to the HD DVD specification for HD DVD players and optical media for the purpose of participating in a joint HD DVD Patent Portfolio License being facilitated by MPEG LA.

As previously announced, the Sonic '621 patent was also deemed essential to the Blu-ray Disc specification for BD players and optical media. The Sonic technology covered in the '621 patent allows for updating or augmenting multimedia content on portable storage media including CD, DVD, UMD, flash memory, HD DVD, and Blu-ray Disc.

Sonic's dynamic content revision technology enables publishers of content on any portable storage media to update or augment that content over the Web or through a local cache. Movie studios, for example, can replace trailers or change menu selections, and game console software makers can deliver in-game advertisements over the internet, providing a cost-effective way to keep content "fresh" and deliver ongoing promotions and e-commerce offerings to form a more direct relationship with the entertainment viewer.

"The inclusion of Sonic in the formation of the HD DVD Patent Portfolio License underscores our technology depth and our continued investment in the success of new digital-media formats," said Dave Habiger, president and CEO, Sonic Solutions.