Secure transmission of digital content between a host and a peripheral by way of a digital rights management (DRM) system

A method performed in combination with a host and a peripheral that couples to the host, the peripheral having a symmetric peripheral key (PK), a copy of (PK) encrypted according to a public key (PU) of an entity ((PU(PK))), and a symmetric binding key (BK) encrypted according to (PK) ((PK(BK))), the method for the host to securely transmit content to the peripheral and comprising:

• the host receiving (PU(PK)) and (PK(BK)) from the peripheral;
• the host sending (PU(PK)) and (PK(BK)) to the entity, the entity having a private key (PR) corresponding to (PU), applying (PR) to (PU(PK)) to obtain (PK), applying (PK) to (PK(BK)) to obtain (BK), and sending (BK) back to the host;
• and
• the host receiving (BK) from the entity, encrypting at least a portion of the content according to (BK), and transmitting the encrypted content to the peripheral, whereby the peripheral may then decrypt the encrypted content based on (BK).

A method performed in combination with a host and a peripheral that couples to the host, the peripheral having a symmetric key (PK) and a copy of (PK) encrypted according to a public key (PU) of an entity ((PU(PK))), the method for the peripheral to securely transmit content to the host and comprising:

• the host receiving (PU(PK)) from the peripheral;
• the host sending (PU(PK)) to the entity, the entity having a private key (PR) corresponding to (PU), applying (PR) to (PU(PK)) to obtain (PK), and sending (PK) back to the host;
• the host receiving (PK) from the entity, selecting a content key (CK) for the content, encrypting (CK) according to (PK) to result in (PK(CK)), placing (PK(CK)) in a digital license, and transmitting the license including (PK(CK)) to the peripheral, whereby the peripheral may then apply (PK) to (PK(CK)) to obtain (CK), encrypt at least a portion of the content according to (CK), and transmit the encrypted content to the host;
• and
• the host applying (CK) to the encrypted content to decrypt same.

A method performed in combination with a host and a peripheral that couples to the host, the peripheral having a symmetric peripheral key (PK), a copy of (PK) encrypted according to a public key (PU) of an entity ((PU(PK))), and a symmetric binding key (BK) encrypted according to (PK) ((PK(BK))), the method for the peripheral to securely transmit content to the host and comprising:

• the host receiving (PU(PK)) and (PK(BK)) from the peripheral;
• the host sending (PU(PK)) and (PK(BK)) to the entity, the entity having a private key (PR) corresponding to (PU), applying (PR) to (PU(PK)) to obtain (PK), applying (PK) to (PK(BK)) to obtain (BK), and sending (BK) back to the host;
• and
• the host receiving (BK) from the entity, selecting a content key (CK) for the content, encrypting (CK) according to (BK) to result in (BK(CK)), placing (BK(CK)) in a digital license, and transmitting the license including (BK(CK)) to the peripheral, whereby the peripheral may then apply (BK) to (BK(CK)) to obtain (CK), encrypt at least a portion of the content according to (CK), and transmit the encrypted content to the host;
• and
• the host applying (CK) to the encrypted content to decrypt same.