Method of transferring digital rights

• US 20070198419A1
• Filed: 02/03/2006
• Published: 08/23/2007
• Est. Priority Date: 02/03/2006
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Park, Joon, Abu-Amara, Hosame
• Granted Patent: US 7,526,451 B2
• Time in Patent Office: Days
• US Class Current: 705/52
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates

Abstract

A system and method of transferring digital rights from a first device to a second device. A target rights management object is transferred from the first device to the second device. A probabilistic data structure is created that identifies each of a class of rights management objects that are present on the first device. The probabilistic data structure is employed to determine whether the target rights management object is present on the first device. The target rights management object is utilized on the second device in response to a determination through employment of the probabilistic data structure that the target rights management object is not present on the first device. The target rights management object and its state are returned to the first device in response to a determination through employment of the probabilistic data structure that the target rights management object is present on the first device.

Claims

1. A method of transferring digital rights from a first device to a second device, the method comprising:

transferring a target rights management object from the first device to the second device;

creating a probabilistic data structure that identifies each of a class of rights management objects that are present on the first device;

employing the probabilistic data structure to determine whether the target rights management object is present on the first device; and

utilizing the target rights management object on the second device in response to a determination through employment of the probabilistic data structure that the target rights management object is not present on the first device.

2. The method of claim 1, further comprising:

returning the target rights management object to the first device in response to a determination through employment of the probabilistic data structure that the target rights management object is present on the first device.

3. The method of claim 1, wherein the step of transferring comprises:

creating an encrypted target rights management object by encrypting the target rights management object with an encryption key;

sending the encrypted target rights management object to the second device; and

removing the target rights management object from the first device upon receipt of an acknowledgement from the second device that it received the encrypted version of the target rights management object.

4. The method of claim 3, further comprising:

requesting the encryption key used to encrypt the target rights management object in response to a determination through employment of the probabilistic data structure that the target rights management object is not present on the first device;

receiving the encryption key; and

decrypting the encrypted target rights management object with the encryption key.

5. The method of claim 1, wherein the step of creating a probabilistic data structure comprises:

generating a bloom filter that includes a bit representation of each of the class of rights management objects that are present on the first device.

6. The method of claim 5, wherein the step of utilizing comprises:

querying the bloom filter to determine whether the target rights management object is present on the first device.

7. The method of claim 5, wherein the step of generating the bloom filter comprises:

assigning a unique identifier to each rights management object present on the first device.

8. The method of claim 7, wherein the step of computing the bloom filter further comprises:

providing the unique identifier of each rights management object as an input to at least one hash function to create at least one hash value; and

asserting a bit in the bloom filter, corresponding to the at least one hash value, as positive.

9. The method of claim 7, wherein the step of assigning the unique identifier comprises:

computing the identifier by using a combination of each rights management object and each rights management object'"'"'s state as input to a hash function.

10. The method of claim 1, further comprising:

verifying that the target rights management object is present on the first device prior to transferring the target rights management object to the second device.

11. The method of claim 10, wherein the step of verifying comprises:

assigning a unique identifier to the target rights management object;

generating a bloom filter that includes a bit representation of each of a class of rights management objects that are present on the first device; and

querying the bloom filter to determine whether a bit representation of the target rights management object is present on the first device.

12. The method of claim 1, wherein the step of creating the probabilistic data structure comprises:

creating the probabilistic data structure such that the class of rights management objects includes all stateful rights objects on the first device.

13. The method of claim 1, wherein the step of creating the probabilistic data structure comprises:

creating the probabilistic data structure such that that class of rights management objects includes a portion of stateful rights objects on the first device.

14. The method of claim 1, wherein the target rights management object is a stateful rights object created in accordance with the Open Mobile Alliance (OMA) Digital Rights Management (DRM) 2.0 standard.

15. A method of transferring a rights management object from a transferring device, the method comprising:

receiving the rights management object;

receiving a probabilistic data structure identifying each of a class of rights management objects present on the transferring device;

employing the probabilistic data structure to determine whether the rights management object is present on the first device; and

utilizing the rights management object in response to a determination through employment of the probabilistic data structure that the rights management object is not present on the transferring device.

16. The method of claim 15, further comprising:

removing the rights management from the second device in response to a determination through employment of the probabilistic data structure that the rights management object is present on the first device.

17. The method of claim 15, wherein the step of receiving the rights management object comprises:

receiving an encrypted version of the rights management object.

18. The method of claim 17, further comprising:

requesting an encryption key to decrypt the rights management object in response to a determination through employment of the

probabilistic data structure that the rights management object is not present on the first device;

receiving the encryption key; and

decrypting the rights management object.

19. The method of claim 15, wherein the step of receiving a probabilistic data structure comprises:

receiving a bloom filter that includes a bit representation of each of the class of rights management objects that are present on the first device.

20. The method of claim 19, wherein the step of employing the probabilistic data structure comprises:

querying the bloom filter to determine whether a bit representation of the rights management object is present in the bloom filter.

23. The method of claim 20, wherein the step of generating the probabilistic data structure comprises:

generating the probabilistic data structure such that the class of rights management objects includes a portion of all stateful rights objects on the device.

21. A method of transferring digital rights from a device, the method comprising:

removing a rights management object from the device;

generating a probabilistic data structure identifying each of a class of rights management objects present on the device;

providing the probabilistic data structure to another device to verify whether the rights management object has been removed from the device.

22. The method of claim 21, wherein the step of generating the probabilistic data structure comprises:

generating the probabilistic data structure such that the class of rights management objects includes all of stateful rights objects on the device.

24. A method of transferring digital rights, comprising:

sending a stateful rights object from a first device to a second device;

sending an acknowledgement to the first device that the second device received the stateful rights object;

deleting the stateful rights object from the first device;

creating a bloom filter, at the first device, that includes a bit representation for each stateful rights object that is present in the first device;

sending the bloom filter to the second device;

searching the bloom filter, at the second device, to determine whether the stateful rights object is present at the first device; and

utilizing the stateful rights object on the second device if the target rights management object is not present on the first device; and

returning the stateful rights object to the first device if the stateful rights object is present on the first device.

25. A method of transferring digital rights, comprising:

sending a stateful rights object from a first device to a second device;

sending an acknowledgement to the first device that the second device received the stateful rights object; and

deleting the stateful rights object from the first device only after receiving the acknowledgement from the first device.

26. The method of claim 25, further comprising:

verifying whether or not the stateful rights object has been deleted from the first device; and

returning the stateful rights object to the first device if the stateful rights object has not been deleted from the first device.

27. The method of claim 25, further comprising:

encrypting the stateful right object prior to sending the stateful rights object to the second device.

28. The method of claim 27, further comprising:

requesting an encryption key from the first device if stateful rights object has been deleted from the first device;

receiving the encryption key; and

decrypting the stateful rights object.