Patent ID: 8261073

Claim:
A digital rights management (DRM) method comprising: configuring at least one processor of a portable storage device to perform the functions of: receiving a hello message request from a host device, wherein the hello message request includes at least a list of certificate revocation list (CRL) information; comparing first information included in the hello message request to stored second information; generating an error code when the first information is unsupported information; and generating a hello message response that contains the error code, wherein the hello message response is a hello message in response to the hello message request, wherein the host device transmits the hello message request to the portable storage device instantaneously upon being connected to the portable storage device, wherein, after the hello message request and the hello message response are exchanged, the host device and the portable storage device perform a mutual authentication process during which the host device and the portable storage device exchange certificates and random numbers in order for each of the host device and the portable storage device to generate a common session key.