Patent ID: 7860802
Filing Date: 2010-12-28
Classification: G06F

Abstract:
1. A computer-implemented method of authorizing access to digital content on a computing device, the content being in an encrypted form and decryptable according to a decryption key (KD), the computer-implemented method comprising: the computing device obtaining a digital license corresponding to the content, the digital license being issued to the computing device having an authorization portion and a decryption portion wherein: the computing device accessing the decryption portion; the computing device obtaining the decryption key (KD) and the root trust authority public key (PU-ROOT) from the accessed decryption portion; the computing device validating the digital signature of the authorization portion by applying the public key (PU-ROOT) of the root trust authority to the digital signature; the computing device verifying that the authorization conditions in the authorization portion allow the exercise of rights in the authorization portion; the computing device verifying that the digital signature has been validated before the decryption key (KD) is employed; and the computing device exercising the rights in the authorization portion by employing the decryption key (KD) to decrypt the encrypted content, wherein the license need not be tied to any particular root trust authority.