Patent ID: 9083513
Filing Date: 2015-07-14
Classification: H04L,H04N

Abstract:
1. A method for use in a first client device of a content distribution network for decrypting encrypted content with a cryptographic element, said network comprising at least a network entity and a plurality of client devices, said method comprising: receiving said encrypted content at said first client device from a second client device; receiving a first encrypted version of said cryptographic element at said first client device from said second client device, said first encrypted version of said cryptographic element being generated by encrypting said cryptographic element using a second cryptographic element associated with a common user of said first and second devices; receiving a second encrypted version of said cryptographic element at said first device from said network entity; deriving said cryptographic element using at least one of said first and second encrypted versions of said cryptographic element; and decrypting said encrypted content using said cryptographic element.