Binding digital content to a portable storage device or the like in a digital rights management (DRM) system
First Claim
1. A method for enabling the rendering of digital content on a device, the method comprising:
- transferring the content to the device;
obtaining a digital license corresponding to the content;
composing a sub-license corresponding to and based on the obtained license and transferring the composed sub-license to the device, to enable rendering of the content on the device only in accordance with the terms of the sub-license on the device, wherein the composed sub-license is transferred to the device after transferring the content to the device,wherein the content is encrypted and decryptable according to a content key and wherein the license includes the content key encrypted into a form un-decryptable by the device, the composing of the sub-license comprising re-encrypting the content key into a form that is decryptable by the device and placing the re-encrypted content key in the sub-license, andwherein the composing of the sub-license further comprises placing indexing information in the sub-license, the indexing information identifying a secret to the device that the device employs to decrypt the encrypted content key.
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Accused Products
Abstract
Digital content is rendered on a device by transferring the content to the device and obtaining a digital license corresponding to the content. A sub-license corresponding to and based on the obtained license is composed and transferred to the device, and the content is rendered on the device only in accordance with the terms of the sub-license. The content is encrypted and decryptable according to a content key, and the sub-license includes the content key encrypted and decryptable according to a secret. The sub-license also includes indexing information identifying the secret to the device. The indexing information in the sub-license is obtained to identify the secret, and the secret is acquired based at least in part on the indexing information. The secret is then applied to the encrypted content key to decrypt and obtain the content key, and the obtained content key is applied to the encrypted content to decrypt and obtain the content. To compose the sub-license and also to render the content, the secret is derived by obtaining a device identifier, acquiring a super-secret, and applying the obtained device identifier and super-secret to a function to derive the secret.
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Citations
24 Claims
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1. A method for enabling the rendering of digital content on a device, the method comprising:
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transferring the content to the device; obtaining a digital license corresponding to the content; composing a sub-license corresponding to and based on the obtained license and transferring the composed sub-license to the device, to enable rendering of the content on the device only in accordance with the terms of the sub-license on the device, wherein the composed sub-license is transferred to the device after transferring the content to the device, wherein the content is encrypted and decryptable according to a content key and wherein the license includes the content key encrypted into a form un-decryptable by the device, the composing of the sub-license comprising re-encrypting the content key into a form that is decryptable by the device and placing the re-encrypted content key in the sub-license, and wherein the composing of the sub-license further comprises placing indexing information in the sub-license, the indexing information identifying a secret to the device that the device employs to decrypt the encrypted content key. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for rendering digital content on a device, the content being encrypted and decryptable according to a content key, the content key being encrypted and decryptable according to a secret, the device having an identifier, the method comprising:
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obtaining the encrypted content key from a digital license corresponding to the content; deriving the secret by; obtaining the device identifier; acquiring a super-secret; and applying the obtained device identifier and super-secret to a function to derive the secret;
(SECRET)=function (device identifier, (SUPER-SECRET));decrypting the content key according to the derived secret; decrypting the content according to the derived content key; and rendering the decrypted content, wherein the super-secret is identified by indexing information in the license, the method further comprising obtaining the indexing information from the license and thereby identifying the super-secret by way of the indexing information. - View Dependent Claims (10, 11, 12)
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13. A computer-readable medium having computer-executable instructions thereon for rendering digital content on a device, the instructions comprising modules including:
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a first module for transferring the content to the device; a second module for obtaining a digital license corresponding to the content; and a third module for composing a sub-license corresponding to and based on the obtained license and transferring the composed sub-license to the device;
the content on the device being rendered only in accordance with the terms of the sub-license on the device after the content is loaded onto the device,wherein the content is encrypted and decryptable according to a content key and wherein the license includes the content key encrypted into a form un-decryptable by the device, the third module composing the sub-license by re-encrypting the content key into a form that is decryptable by the device and placing the re-encrypted content key in the sub-license, and wherein the third module places indexing information in the sub-license, the indexing information identifying a secret to the device that the device employs to decrypt the encrypted content key. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A computer-readable medium having computer-executable instructions thereon for rendering digital content on a device, the content being encrypted and decryptable according to a content key, the content key being encrypted and decryptable according to a secret, the device having an identifier, the instructions comprising modules including:
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a first module for obtaining the encrypted content key from a digital license corresponding to the content; a second module for deriving the secret by; obtaining the device identifier; acquiring a super-secret; and applying the obtained device identifier and super-secret to a function to derive the secret;
(SECRET)=function (device identifier, (SUPER-SECRET));a third module for decrypting the content key according to the derived secret; a fourth module for decrypting the content according to the derived content key; and a fifth module for rendering the decrypted content, wherein the super-secret is identified by indexing information in the license, the method further comprising a sixth module for obtaining the indexing information from the license and thereby identifying the super-secret by way of the indexing information. - View Dependent Claims (22, 23, 24)
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Specification