Tethered device systems and methods

• US 8,850,195 B2
• Filed: 07/23/2008
• Issued: 09/30/2014
• Est. Priority Date: 07/23/2007
• Status: Expired due to Fees

• Current Assignee: Intertrust Technologies Corporation (Fidelio Acquisition Co LLC)
• Original Assignee: Intertrust Technologies Corporation (Fidelio Acquisition Co LLC)
• Inventors: Boccon-Gibod, Gilles, Boeuf, Julien, Ellison, Gary F., Maher, David P.
• Primary Examiner(s): SCOTT, RANDY A
• Application Number:
  US12/178,588
• Publication Number:
  US 20090037732A1
• Time in Patent Office: 2,260 Days
• Field of Search: 726/20, 726/22, 726/27, 726/28, 726/30, 713/164, 713/168, 713/171
• US Class Current: 713/168
• CPC Class Codes: G06F 21/1012 to domains
• CPC Class Codes: G06F 21/1013 to locations
• CPC Class Codes: G06F 21/1015 to users
• CPC Class Codes: G06F 21/1073 Conversion
• CPC Class Codes: G06Q 20/3829 involving key management
• CPC Class Codes: G06Q 50/184 Intellectual property management
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838

Abstract

Systems and methods are described for applying digital rights management techniques to tethered devices. In one embodiment, a host device is operable to translate a relatively sophisticated license into a simpler format for use on a relatively low-capability device. In another embodiment, a method of using extended SCSI commands to communicate over a USB connection is provided.

Claims

1. A method comprising:

identifying a simple validity statement associated with an encrypted piece of electronic content, the simple validity statement having been generated by a host device and derived from a license comprising one or more control programs;

using a pairing key generated by the host device to verify a digital signature associated with at least part of the simple validity statement;

evaluating one or more conditions expressed in the simple validity statement to determine if the simple validity statement is valid;

if the simple validity statement is determined to be valid, using the pairing key to decrypt a content decryption key; and

decrypting the encrypted piece of electronic content using the content decryption key,

wherein the pairing key is generated based on a pairing between the host device and a particular device.

2. The method of claim 1, in which the step of evaluating one or more conditions comprises determining whether a current time value is before a first predefined time value.

3. The method of claim 2, in which the step of evaluating one or more conditions comprises determining whether the current time value is after a second predefined time value.

4. The method of claim 1, in which the step of evaluating one or more conditions comprises determining whether a first state variable is set to a predefined value.

5. The method of claim 2, in which the step of evaluating one or more conditions comprises determining whether a first state variable is set to a predefined value.

6. The method of claim 1, in which the step of evaluating one or more conditions comprises determining whether a first node is reachable.

7. The method of claim 2, in which the step of evaluating one or more conditions comprises determining whether a first node is reachable.

8. The method of claim 5, in which the step of evaluating one or more conditions comprises determining whether a first node is reachable.