Patent ID: 8291236
Filing Date: 2012-10-16
Classification: H04L,H04N

Abstract:
1. A method to control a presentation of content, the method comprising: receiving a representation of content from a first conditional access server which provides the content in an encrypted form and uses a first set of cryptographic keys to protect the content from unauthorized access in a first security domain; and presenting the content, at a user's request, through a second conditional access server which is coupled to the first conditional access server; wherein the presenting of the content is authorized through a client server relationship between the second and the first conditional access servers respectively; wherein the second conditional access server uses a second set of cryptographic keys to protect the content from unauthorized access in presenting the content in a second security domain; and wherein the first conditional access server authenticates the second conditional access server as one of client devices of the first conditional access server through a first authentication process using a first root of trust and the second conditional access server authenticates client devices of the second conditional access server through a second authentication process which is independent of the first authentication process and wherein the second authentication process uses a second root of trust which is independent of and different than the first root of trust, and wherein the second conditional access server is configured to substitute the first security domain with the second security domain for the client devices under the second root of trust.