Tethered device systems and methods

摘要

Systems and methods are described for applying digital rights management techniques to tethered devices. In one embodiment, a host device is operable to translate a relatively sophisticated license into a simpler format for use on a relatively low-capability device. In another embodiment, a method of using extended SCSI commands to communicate over a USB connection is provided.

主权项

1. A method comprising:
identifying a simple validity statement associated with an encrypted piece of electronic content, the simple validity statement having been generated by a host device and derived from a license comprising one or more control programs; using a pairing key generated by the host device to verify a digital signature associated with at least part of the simple validity statement; evaluating one or more conditions expressed in the simple validity statement to determine if the simple validity statement is valid; if the simple validity statement is determined to be valid, using the pairing key to decrypt a content decryption key; and decrypting the encrypted piece of electronic content using the content decryption key, wherein the pairing key is generated based on a pairing between the host device and a particular device.