3.2.5.4 Direct License Acquisition
For devices that acquire licenses directly over the internet, changes have been made to improve playback performance without requiring changes to the direct license acquisition (DLA) protocol as follows:
The device acquires a license from a Media Rights Manager license server using the existing DLA protocol.
The device derives its symmetric key from its private key using the SHA-1 algorithm.
The device decrypts the content key using its private key.
The device re-encrypts the content key using its symmetric key.
The device regenerates the license hash using SHA-1 and HMAC using its symmetric key.
The device stores the license in the license store.