Note
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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.