G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 19/02 (2006.01) H04L 9/32 (2006.01) H04L 12/22 (2006.01) H04N 5/775 (2006.01) H04N 5/91 (2006.01)
Patent
CA 2507287
A method and apparatus for marking a video or audio signal to prevent unauthorized copying of the signal. The method includes supplying the audio or video signal; embedding a first watermark in the audio or video signal; transmitting the video or audio signal to a user; and finally embedding a second watermark in the signal in response to an action by the user.
Un procédé et un dispositif destinés à marquer un signal vidéo ou audio pour en empêcher une reproduction non autorisée. La méthode consiste à fournir le signal audio ou vidéo; incorporer une première filigrane dans le signal audio ou vidéo; transmettre le signal vidéo ou audio à un utilisateur; et enfin, incorporer une deuxième filigrane dans le signal en réponse à une action par l'utilisateur.
Hollar Mark A.
Wonfor Peter
Kirby Eades Gale Baker
Macrovision Corporation
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