| For all feature film content, the digital files are encrypted with the 128-bit AES algorithm to ensure that the content simply cannot be cracked. A specific Security Key for the target digital cinema server is necessary to decode the content. These Keys are encrypted with an even more secure algorithm, the 2048-bit RSA. These security algorithms are fool-proof and are the same ones that are used by banks to secure their transactions. With the Device Certificate of the target server, the QubeMaster application generates a Key Delivery Messages or KDM that will allow playback of the content on that specific server for a period defined by the user when creating the KDM.
The KDM contains the key(s) required to decrypt the digitized, compressed content. Every movie needs a unique KDM for each server. This means that to play a movie on a given server, one would require the corresponding unique KDM. If the movie files are moved to another server, one would require another KDM for that movie to play from the new server.
At the time of Exhibition of the content, the movie files are loaded on a server, along with the KDM specific to that movie and that particular server. However, it must be noted that each KDM comes with a pre-set Validity period, which clearly indicates that date from which the Key is valid, and also the date on which this validity expires. Beyond this date the KDM loses its validity and one needs to procure a new KDM if the movie is to be screened beyond that date. This security mechanism thus provides the distributor or producer, the same level of control that a physical print provides and also gives the Exhibitor the same level of control as with a physical print. |
