US 12,141,245 B2
Re-encryption-based digital rights management
Eric Diehl, Burbank, CA (US)
Assigned to SONY GROUP CORPORATION, Tokyo (JP); and SONY PICTURES ENTERTAINMENT, INC., Culver City, CA (US)
Filed by Sony Group Corporation, Tokyo (JP); and Sony Pictures Entertainment Inc., Culver City, CA (US)
Filed on Jan. 19, 2022, as Appl. No. 17/578,970.
Prior Publication US 2023/0229743 A1, Jul. 20, 2023
Int. Cl. H04L 29/06 (2006.01); G06F 21/10 (2013.01); H04L 9/08 (2006.01); H04L 9/32 (2006.01)
CPC G06F 21/105 (2013.01) [H04L 9/0869 (2013.01); H04L 9/0891 (2013.01); H04L 9/3213 (2013.01); H04L 9/3268 (2013.01); G06F 21/107 (2023.08)] 20 Claims
OG exemplary drawing
 
1. A method for encrypting a document, the method comprising:
generating and delivering a first nonce to a license manager;
generating and delivering a second nonce to a rights manager;
combining the first nonce received at the license manager and the second nonce received at the rights manager to generate a secret key that is deterministically defined by the first and second nonces;
delivering the generated secret key;
receiving and encrypting the document using the secret key to produce an encrypted document and a document identifier; and
delivering the document identifier to the rights manager.