Patent ID: 8213602

Claim:
A method for encrypting a data stream including a video content, said method comprising: encrypting a first portion of said video content of said data stream with a first encryption algorithm utilizing a first key to generate a first encrypted portion, wherein said first portion is defined by a first pre-determined period of time and spans for said first pre-determined period of time; transmitting data indicating said first encryption algorithm and said first key; transmitting said first encrypted portion; changing said first encryption algorithm to a second encryption algorithm after said first pre-determined period of time; encrypting a second portion of said video content of said data stream with said second encryption algorithm utilizing said first key to generate a second encrypted portion, wherein said second portion is defined by a second pre-determined period of time and spans for said second pre-determined period of time; transmitting data indicating said second encryption algorithm; transmitting said second encrypted portion; changing said first key to a second key; encrypting a third portion of said video content of said data stream with said second encryption algorithm utilizing said second key to generate a third encrypted portion, wherein said third portion is defined by a third pre-determined period of time and spans for said third pre-determined period of time; transmitting data indicating said second key; transmitting said third encrypted portion.