System and method for representing a secure time in a device based upon an insecure clock

• US 8,316,456 B2
• Filed: 12/30/2004
• Issued: 11/20/2012
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Siukonen, Juha
• Primary Examiner(s): Shan, April
• Assistant Examiner(s): Pan, Joseph
• Application Number:
  US11/026,944
• Publication Number:
  US 20060150254A1
• Time in Patent Office: 2,882 Days
• Field of Search: 713/1, 713/2, 713/188, 713/194, 713/178, 713/400, 713/502, 713/600, 380/200, 380/201, 380/255, 380/277, 380/25, 726/2, 726/22, 726/27, 726/7, 705/57
• US Class Current: 726/27
• 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 21/725 operating on a secure reference time value

Abstract

A system and method for providing modified rights information to an application on an electronic device. A centralized component monitors both a system clock and a secure clock. The centralized component calculates the difference between the time of the system clock and the time of the secure clock and thereafter modifies the access rights information for the application by the difference between the times. The modified access rights information is then presented to the application for use.

Claims

1. A method comprising:

monitoring a system clock of an electronic device;

accessing a secure clock, wherein information regarding the secure clock is hidden from an application of the electronic device or a user of the electronic device;

receiving, by the electronic device, a request for access rights information from an application of the electronic device;

calculating, by the electronic device, a difference between a time of the system clock and a time of the secure clock;

modifying, by the electronic device, said access rights information at least in part by the difference between the time of the system clock and the time of the secure clock, wherein said access rights information defines when content can be accessed; and

providing, by the electronic device, the modified access rights information to the application.

2. The method of claim 1, further comprising providing a time to a user based upon the difference between the time of the system clock and the time of the secure clock.

3. The method of claim 1, further comprising providing information to other applications based upon the time of the secure clock.

4. The method of claim 1, wherein the access rights information is a rights object conforming to a digital rights management standard, and modifying said access rights information includes changing permissions of the rights object such that the difference between the system clock and the secure clock is compensated for in the permissions of the rights object.

5. The method of claim 4, further comprising:

receiving, at the electronic device, the rights object from a content provider; and

granting access to content based only on a comparison between the changed permissions of the rights object and the system clock.

6. One or more non-transitory memory units storing computer readable instructions configured to, when executed, cause an apparatus to at least:

monitor a system clock of the apparatus;

access a secure clock, wherein information regarding the secure clock is hidden from an application of the electronic device or a user of the electronic device;

receive a request for access rights information from an application of the apparatus;

calculate a difference between a time of the system clock and a time of the secure clock;

modify said access rights information at least in part by the difference between the time of the system clock and the time of the secure clock, wherein said access rights information defines when content can be accessed; and

provide the modified access rights information to the application.

7. The one or more non-transitory memory units of claim 6, further storing computer readable instructions configured to, when executed, cause the apparatus to provide a time to a user based upon the difference between the time of the system clock and the time of the secure clock.

8. The one or more non-transitory memory units of claim 6, further storing computer readable instructions configured to, when executed, cause the apparatus to provide information to other applications based upon the time of the secure clock.

9. The one or more non-transitory memory units of claim 6, wherein the access rights information is a rights object conforming to a digital rights management standard, and wherein modifying said access rights information includes changing permissions of the rights object such that the difference between the system clock and the secure clock is compensated for in the permissions of the rights object.

10. An apparatus, comprising:

a processor;

one or more memory units storing computer readable instructions configured to, with the processor, cause the apparatus to at least;

monitor a system clock of the apparatus;

access a secure clock, wherein information regarding the secure clock is hidden from an application of the electronic device or a user of the electronic device;

receive a request for access rights information from an application of the apparatus;

calculate a difference between a time of the system clock and a time of the secure clock;

modify said access rights information at least in part by the difference between the time of the system clock and the time of the secure clock, wherein said access rights information defines when content can be accessed; and

provide the modified access rights information to the application.

11. The apparatus of claim 10, wherein the one or more memory units further store computer readable instructions configured to, with the processor, cause the apparatus to provide a time to a user based upon the difference between the time of the system clock and the time of the secure clock.

12. The apparatus of claim 10, wherein the one or more memory units further store computer readable instructions configured to, with the processor, cause the apparatus to provide information to other applications based upon the time of the secure clock.

13. The apparatus of claim 10, wherein the access rights information is a rights object conforming to a digital rights management standard, and wherein modifying the access rights information includes changing permissions of the rights object such that the difference between the system clock and the secure clock is compensated for in the permissions of the rights object.