CONTENT PROTECTION SYSTEM AND METHOD FOR ENABLING SECURE SHARING OF COPY-PROTECTED CONTENT
First Claim
1. A content protection system for enabling secure sharing of a piece of content which is encrypted for copy-protection, wherein the piece of content and a first license file is associated with a first user, and the first license file securely includes a first decryption key needed to decrypt the content and restrictions on the piece of content with respect to the first user, the first user is authorized to use the piece of content according to the restrictions in the first license file, the system comprising:
- a first processing unit for enabling the first user to send a request for sharing the piece of content with at least a second user, wherein the request includes identification information of the second user and the piece of content;
a license management unit, in response to the request, for generating a second license file for the second user which is associated with the first license file, the piece of content, and the second user, wherein the second license file securely includes a second decryption key needed to decrypt the piece of content and restrictions on the piece of content with respect to the second user; and
wherein the second user is authorized to use a shared copy of the piece of content according to the restrictions in the second license file.
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Accused Products
Abstract
A content protection system for enabling secure sharing of a piece of content encrypted for copy-protection and a method therefor. The system includes a first processing unit and a license management unit. The first processing unit is for enabling the first user to send a request for sharing the piece of content with at least a second user. The license management unit, in response to the request, is used for generating a second license file for the second user which is associated with the first license file, the piece of content, and the second user, wherein the second license file securely includes a second decryption key needed to decrypt the piece of content and restrictions on the piece of content with respect to the second user. The second user is authorized to use a shared copy of the piece of content according to the restrictions in the second license file.
113 Citations
33 Claims
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1. A content protection system for enabling secure sharing of a piece of content which is encrypted for copy-protection, wherein the piece of content and a first license file is associated with a first user, and the first license file securely includes a first decryption key needed to decrypt the content and restrictions on the piece of content with respect to the first user, the first user is authorized to use the piece of content according to the restrictions in the first license file, the system comprising:
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a first processing unit for enabling the first user to send a request for sharing the piece of content with at least a second user, wherein the request includes identification information of the second user and the piece of content; a license management unit, in response to the request, for generating a second license file for the second user which is associated with the first license file, the piece of content, and the second user, wherein the second license file securely includes a second decryption key needed to decrypt the piece of content and restrictions on the piece of content with respect to the second user; and wherein the second user is authorized to use a shared copy of the piece of content according to the restrictions in the second license file. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A content protection method for enabling secure sharing of a piece of content which is encrypted for copy-protection, wherein the piece of content and a first license file is associated with a first user, and the first license file securely includes a first decryption key needed to decrypt the content and restrictions on the piece of content with respect to the first user, the first user is authorized to use the piece of content according to the restrictions in the first license file, the method comprising,
(a) sending a request for sharing the piece of content with at least a second user, wherein the request includes identification information of the second user and the piece of content; -
(b) in response to the request, generating a second license file for the second user which is associated with the first license file, the piece of content and the second user, wherein the second license file securely includes a second decryption key needed to decrypt the piece of content and restrictions on the piece of content with respect to the second user; and wherein the second user is authorized to use a shared copy of the piece of content according to the restrictions in the second license file. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A license management apparatus for use in a content protection system for enabling secure sharing of a piece of content which is encrypted for copy-protection, wherein the piece of content and a first license file is associated with a first user, and the first license file securely includes a first decryption key needed to decrypt the content and restrictions on the piece of content with respect to the first user, the first user is authorized to use the piece of content according to the restrictions in the first license file, the license management apparatus:
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a storage device for storing license information including information corresponding to the first license file; a management unit, in response to a request for sharing the piece of content with at least a second user, wherein the request includes identification information of the second user and the piece of content, the management unit being for generating a second license file for the second user which is associated with the first license file, the piece of content, and the second user, according to the first license file and the request, wherein the second license file securely includes a second decryption key needed to decrypt the piece of content and restrictions on the piece of content with respect to the second to user, and wherein the second user is authorized to use a shared copy of the piece of content according to the restrictions in the second license file.
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Specification