Automatic Application of Information Protection Policies

• US 20090260054A1
• Filed: 04/11/2008
• Published: 10/15/2009
• Est. Priority Date: 04/11/2008
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Ray, Kenneth D., Yarmolenko, Vladimir, Zhong, Yuhui, Bryce, Duncan G., Cottrille, Scott C., Kostal, Gregory, Karamfilov, Krassimir, Kamat, Pankaj Mohan
• Granted Patent: US 7,987,496 B2
• Time in Patent Office: Days
• US Class Current: 726/1
• CPC Class Codes: H04L 63/0227 Filtering policies mail message filtering H04L51/212

Abstract

The secure application of content protection policies to content. The secure application of content protection polices is accomplished by having an enforcement mechanism monitor policy application points to detect the transfer of content. The enforcement mechanism accesses the content and a determination is made to protect the content. A usage policy is then identified by the enforcement mechanism to apply to the content and the usage policy is then applied to the content, resulting in a usage policy for the content.

Claims

1. In a computing environment, a method for the secure application of a usage policy to content based on content classification rules describing correlations associating a system state with a usage policy, wherein the application of the usage policy results in a content protected to the usage policy, the method comprising:

monitoring a pre-defined policy application point to detect the transfer of content;

accessing the content being transferred through the pre-defined policy application point;

determining, based on the content, the content classification rules and the system state, that the content should be protected, wherein the content classification rules are maintained in a repository at a known location so that any appropriate enforcement mechanism can access the policy rule;

identifying, based on the content, the content classification rules and the system state, a usage policy to apply to the content, wherein the usage policy is maintained at the repository so that any appropriate enforcement mechanism can access the policy rule; and

applying the usage policy to the content, wherein the application of the usage policy results in a functional usage policy for the content.

2. The method of claim 1, wherein the pre-defined policy application point comprises a file system, the file system having enhanced capabilities comprising:

the ability to associate a usage policy with a file;

the ability to associate a usage policy with a directory; and

the ability to transparently process the usage policy of a file and directory.

3. The method of claim 1, wherein the predefined policy application point comprises a server, the server having enhanced capabilities comprising:

the ability to associate a usage policy with an email message;

the ability to associate a usage policy template with a category of email messages; and

the ability to transparently process the usage policy in email server routing, delivery and storage.

4. The method of claim 1, wherein the pre-defined policy application point comprises a device driver, the device driver having enhanced capabilities comprising:

the ability to monitor content transferred to a device related to the device driver;

the ability to cause a usage policy to be applied to the content being transferred to the device; and

the ability to transparently process the usage policy for content passing through the device driver.

5. The method of claim 1, wherein the pre-defined policy application point comprises an extensible policy application point layer, the extensible policy application point layer having enhanced capabilities comprising:

the ability to monitor content processed by the application associated with the extensible policy application point layer,

the ability to cause a usage policy to be applied to the content being processed by the application associated with the extensible policy application point layer; and

the ability to transparently process the usage policy for content passing through the extensible policy application point.

6. The method of claim 1, further comprising disabling the automatic application of the usage policy for predetermined content types.

7. The method of claim 1, wherein the repository of content classification rules is discoverable and available by policy administrators and policy enforcement systems.

8. The method of claim 1 further comprising maintaining a central repository of content classification rules wherein the content classification rules are securely transferred to the repository location known to all user machines wherein a local user is unable to tamper with the content classification rules without detection and wherein the local user is unable to block transfer of the content classification rules without detection.

9. A computer-readable storage media storing computer executable instructions that when executed implement a method for the secure application of a usage policy to content based on content classification rules describing correlations associating a system state with a usage policy, wherein the application of the usage policy results in a functional usage policy for the content, the method comprising:

monitoring a pre-defined policy application point to detect the transfer of content;

accessing the content being transferred through the pre-defined policy application point;

determining, based on the content, the content classification rules and the system state, that the content should be protected, wherein the content classification rules are maintained in a repository at a known location so that any appropriate enforcement mechanism can access the policy rule;

identifying, based on the content, the content classification rules and the system state, a usage policy that is to be applied to the content, wherein the usage policy is maintained at the repository so that any appropriate enforcement mechanism can access the policy rule; and

applying the usage policy wherein the application of the usage policy template results in a functional usage policy for the content.

10. The computer-readable storage media of claim 9 wherein the pre-defined policy application point comprises a file system, the file system having enhanced capabilities comprising:

the ability to associate a usage policy with a file;

the ability to associate a usage policy with a directory; and

the ability to transparently process the usage policy of a file.

11. The computer-readable storage media of claim 9, wherein the predefined policy application point comprises an email server, the email server having enhanced capabilities comprising:

the ability to transparently associate a usage policy with an email message;

the ability to transparently associate a usage policy with a category of email messages; and

the ability to transparently process the usage policy in email server routing, delivery and storage.

12. The computer-readable storage media of claim 9, wherein the pre-defined policy application point comprises a device driver, the device driver having enhanced capabilities comprising:

the ability to transparently monitor content transferred to a device related to the device driver; and

the ability to transparently cause a usage policy to be applied to the content being transferred to the device.

13. The computer-readable storage media of claim 9, wherein the pre-defined policy application point comprises an extensible policy application point layer, the extensible policy application point layer having enhanced capabilities comprising:

the ability to transparently monitor content processed by the application associated with the extensible policy application point layer,

the ability to transparently cause a usage policy to be applied to the content being processed by the application associated with the extensible policy application point layer.

14. The computer-readable storage media of claim 9, further comprising disabling the automatic application of the usage policy for pre selected content types.

15. The computer-readable storage media of claim 9, wherein the repository of content classification rules is discoverable by policy administrators and policy enforcement systems.

16. The computer-readable storage media of claim 9 further comprising maintaining a central repository of content classification rules wherein the content classification rules are securely transferred to the repository location known to all user machines wherein a local user is unable to tamper with the content classification rules without detection and wherein the local user is unable to block transfer of the content classification rules to their machine without detection.

17. In a computing environment, a system for applying a usage policy to content based on content classification rules describing correlations associating a system state with a usage policy, wherein the application of the usage policy results in a functional usage policy for the content, the system comprising:

a processor executing computer-executable instructions; and

a computer-readable storage media storing the computer-executable instructions, wherein the computer-executable instructions cause the system to perform a method when executed, the method comprising;

monitoring a pre-defined policy application point to detect the transfer of content;

accessing the content being transferred through the pre-defined policy application point;

determining, based on the content, the content classification rules and the system state, that the content should be protected, wherein the content classification rules are maintained in a repository at a known location so that any appropriate enforcement mechanism can access the policy rule;

identifying, based on the content, the content classification rules and the system state, a usage policy that is to be applied to the content, wherein the usage policy is maintained at the repository so that any appropriate enforcement mechanism can access the policy rule; and

applying the usage policy to the content, wherein the application of the usage policy template results in a functional usage policy for the content.

18. The system of claim 17 wherein the pre-defined policy application point is associated with one of a device drive, a file system, an email server, and an extensible application layer.

19. The system of claim 17 wherein the repository known to all user machines comprises a central repository of content classification rules

20. The system of claim 17 wherein the repository known to all user machines comprises a local repository of content classification rules.