Binding content to a portable storage device or the like in a digital rights management (DRM) system

A method for composing a digital license for rendering digital content on a device, the content being encrypted and decryptable according to a content key, the device having an identifier, the method comprising:

• deriving a secret by:
• obtaining the device identifier;
• acquiring a super-secret that is also acquirable by the device;
• and
• applying the obtained device identifier and the super-secret to a function to derive the secret:
• (SECRET)=function (device identifier, (SUPER-SECRET));
• encrypting the content key according to the derived secret such that the content key is decryptable according to the secret;
• and
• placing the encrypted content key in the digital license, the digital license used for rendering digital content on the device,
• wherein the super-secret is identified by indexing information, the method further comprising placing the indexing information in the digital license, whereby the device may obtain the indexing information from the digital license and thereby identify the super-secret by way of the indexing information.

A computer-readable medium having computer-executable instructions thereon for rendering digital content on a device, the instructions comprising modules including:

• a first module for receiving the content onto the device, the content being encrypted and decryptable according to a content key;
• a second module for receiving a digital license corresponding to the content onto the device, the license including the content key encrypted and decryptable according to a secret, the license also including indexing information identifying the secret to the device, the second module receiving the digital license after the content is received on the device, wherein the license includes the content key encrypted into a form un-decryptable by the device, the license including a sub-license comprising a re-encrypted content key that is decryptable by the device;
• a third module for obtaining the indexing information in the license to identify the secret;
• a fourth module for acquiring the secret based at least in part on the indexing information;
• a fifth module for applying the secret to the encrypted content key to decrypt and obtain the content key;
• and
• a sixth module for applying the obtained content key to the encrypted content to decrypt and obtain the content.

A computer-readable medium having computer-executable instructions thereon for composing a digital license for rendering digital content on a device, the content being encrypted and decryptable according to a content key, the device having an identifier, the instructions comprising modules including:

• a first module for deriving a secret by:
• obtaining the device identifier;
• acquiring a super-secret that is also acquirable by the device;
• and
• applying the obtained device identifier and super-secret to a function to derive the secret:
• (SECRET)=function (device identifier, (SUPER-SECRET));
• a second module for encrypting the content key according to the derived secret such that the content key is decryptable according to the secret;
• and
• a third module for placing the encrypted content key in the digital license, the digital license used for rendering digital content on the device,
• wherein the super-secret is identified by indexing information, the medium further comprising a fourth module for placing the indexing information in the digital license, whereby the device may obtain the indexing information from the digital license and thereby identify the super-secret by way of the indexing information.