Controlling access to digital content

• US 8,566,695 B2
• Filed: 03/30/2007
• Issued: 10/22/2013
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: Sandisk Technologies Incorporated (Western Digital Corporation)
• Inventors: Jogand-Coulomb, Fabrice
• Primary Examiner(s): Mills, Frank D
• Application Number:
  US11/694,866
• Publication Number:
  US 20080244713A1
• Time in Patent Office: 2,398 Days
• Field of Search: 715/204
• US Class Current: 715/204
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06F 2221/2135 Metering
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources

Abstract

Method for utilizing digital content is provided. The method includes controlling a throughput rate for utilizing the digital content by an accessing system, wherein the throughput rate is associated with information related to the digital content stored as a file.

Claims

1. A method for controlling access to digital content, comprising:

in a storage system with digital content, the digital content stored as a file, performing;

controlling a throughput rate associated with access to the digital content in the storage system, wherein while the storage system is operationally coupled to an accessing system, the digital content is retrievable by the accessing system at a transmission rate according to the throughput rate, and wherein the throughput rate depends on a bit rate of retrieval of the digital content by the accessing system; and

performing a cryptographic operation on the digital content by;

partially performing a cryptographic function on the digital content;

interrupting the cryptographic function by adding a first delay to the cryptographic operation; and

resuming the cryptographic function,

wherein the cryptographic operation reduces the throughput rate.

2. The method of claim 1, wherein the throughput rate is included with a digital rights management (DRM) permission in a content license and the content license is used to control access to the digital content.

3. The method of claim 2, wherein the content license includes a plurality of throughput rates for different operations that are used for accessing the digital content.

4. The method of claim 1, wherein the throughput rate is associated with a cipher key that is used to pre-process the digital content.

5. The method of claim 1, wherein the bit rate is related to an encoding type used to encode the digital content.

6. The method of claim 1, wherein the bit rate is related to a format of stored digital content.

7. The method of claim 1, wherein the bit rate is related to a content type of the digital content.

8. The method of claim 1, wherein the information is a naming schema that indicates an operation for utilizing the digital content and the throughput rate is associated with the operation.

9. The method of claim 1, wherein the storage system adjusts the transmission rate at which the digital content is transmitted to reach a rate not to exceed the throughput rate.

10. The method of claim 1, further comprising controlling transmission of the digital content at a first rate until receipt of a command allowing transmission of the digital content at a second rate.

11. The method of claim 1, further comprising:

parsing the digital content;

determining the bit rate from the parsed digital content; and

using the bit rate to set the throughput rate.

12. The method of claim 1, wherein the information comprises a security key, and wherein the storage system obtains the throughput rate by a command that is used to load or create the security key.

13. The method of claim 1, wherein an average bit rate value is used to set the throughput rate.

14. The method of claim 1, wherein the throughput rate is equal to the bit rate.

15. The method of claim 1, wherein the throughput rate is greater than the bit rate.

16. The method of claim 1, further comprising interrupting the resumed cryptographic operation and adding a second delay to the cryptographic operation.

17. A storage system, comprising:

a hardware interface to an accessing system; and

a memory controller configured to control a throughput rate of digital content to be sent to the accessing system via the interface while the storage system is operationally coupled to the accessing system,

wherein the throughput rate depends on a bit rate of retrieval of the digital content by the accessing system, and wherein the throughput rate is reduced during a cryptographic operation by;

partially performing a cryptographic function on the digital content;

interrupting the cryptographic function by adding a first delay to the cryptographic operation; and

resuming the cryptographic function.

18. The storage system of claim 17, wherein the memory controller is further configured to:

parse the digital content;

determine the bit rate from the parsed digital content; and

use the bit rate to set the throughput rate.

19. The storage system of claim 17, wherein the controller is further configured to adjust a data rate at which the digital content is transmitted to reach a rate not to exceed the throughput rate.

20. The storage system of claim 17, wherein the controller is further configured to control transmission of the digital content at a first rate until receipt of a command allowing transmission of the digital content at a second rate.