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2.2.1.3 Cryptographic Keys

The client and server use a set of cryptographic keys as follows:

KC: An ECC1 key that represents the client application. The client knows KCpriv and the server knows KCpub.

KS: A well-known ECC1 key used to protect the privacy of packets sent between client and server. The client knows KSpub and the server knows KSpriv.

KL: An ECC1 key that represents the license server. The server knows KLpub and KLpriv.

KM: An ECC1 key that represents a specific instance of a machine running the client application. The key pair is either created by or issued to the DRM system during a one-time initialization process. The details are implementation-specific.

KMpub is transmitted from the client to server during a license request.