3.2.5.6 Sending Server Upgrade Licenses
The Server Upgrade License message MUST be sent to the client to upgrade a license in its license store. The message type is UPGRADE_LICENSE (0x04) in the licensing preamble.
The EncryptedLicenseInfo field is the license information structure after encryption with the license encryption key, using RC4. The BLOB type is BB_ENCRYPTED_DATA_BLOB (0x0009). The MACData field is the 128-bit MD5 digest generated from the unencrypted upgraded license.