Digital rights management system and methods for provisioning content to an intelligent storage
View Patent ↗The present invention relates to digital rights management (DRM) for content that downloaded and saved to a storage device. The storage may be a disk drive, or network attached storage. In addition, the storage device performs cryptographic operations and provides a root of trust. The DRM employs a binding key, a content key, and an access key. The binding key binds the content to a specific storage and is based on a key that is concealed on the storage. The binding key is not stored on the storage device with the content. The content key is a key that has been assigned to the content. The access key is determined based on a cryptographic combination of the content key and the binding key. In one embodiment, the content is provisioned based on the access key and stored in encrypted form in the storage device.
1. A computing system comprising:
a data storage device storing encrypted media content and a content key that uniquely identifies the media content, the data storage device comprising a controller configured to generate a binding key that binds the encrypted content to the data storage device; and
a host subsystem comprising one or more processors configured to:
receive the binding key and the content key from the data storage device;
generate an access key based on the binding key and the content key;
receive the encrypted media content from the data storage device; and
decrypt the encrypted media content using the access key.
2. The system of claim 1 , wherein the binding key is based on a key that is concealed on the data storage device.
3. The system of claim 1 , wherein the one or more processors are further configured to:
authenticate the data storage device; and
establish a secured communication channel with the data storage device based on the authentication.
4. The system of claim 1 , wherein the one or more processors are further configured to request the binding key from the data storage device as an ephemeral key.
5. The system of claim 1 , wherein the one or more processors are further configured to generate the access key based on a request received from the storage device.
6. The system of claim 1 , wherein the one or more processors are further configured to generate the access key based on a one-way function.
7. The system of claim 1 , wherein the binding key is based at least partly on manufacturing defects information associated with a storage medium of the data storage device.
8. The system of claim 7 , wherein the storage medium comprises magnetic media.
9. A method of provisioning content to a storage device from a download site, said method comprising:
providing, to a remote download server, a binding key that binds media content from the download site to a data storage device;
receiving, from the remote download server, an access key based on the binding key and a content key that uniquely identifies the media content;
receiving, from the remote download server, the content key;
storing the content key in a non-user area of the data storage device;
receiving, from the remote download server, an encrypted version of the media content that is encrypted based on the access key; and
storing the encrypted version of the media content in a user area of the data storage device.
10. The method of claim 9 , further comprising establishing a secured communication channel with the remote download server based on an authentication of the remote download server.
11. The method of claim 9 , wherein the binding key is based on a concealed key that is concealed in the data storage device.
12. The method of claim 9 , wherein the binding key is unique to a class of data storage devices and based on a concealed key that is concealed in the data storage device.
13. The method of claim 9 , further comprising mutually authenticating with the remote download server.
14. The method of claim 9 , wherein providing the binding key comprises ephemerally generating the binding key based on information that is unique to the data storage device and a key that is concealed in the data storage device.
15. The method of claim 9 , wherein the binding key is based at least partly on manufacturing defects of a storage medium of the data storage device.
16. The method of claim 15 , wherein the storage medium comprises magnetic media.