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4-1

Using the DCP and Self KDM

When a DCP of a feature film is created, it is usually encrypted with the

decryption key stored in the KDMs. The decryption key in each KDM is

also encrypted, and it can be decrypted only with the private key of the

respective D-Cinema player for whom it was created. The conclusion of

this is that, once an encrypted DCP is created, it cannot be modified or

checked for flaws that may have occurred during the encoding and/or

wrapping processes. The DCP together with a KDM and all other extra

files are self-contained, intended only for a specific usage in a defined

period of time on a particular device.

DVS’s solution to this problem is the self KDM that can be created to-

gether with the other KDMs. It has to be generated with the public key

of a DVS DCI Mastering system, which can be either the one used to

create the DCP or any other one (e.g. another CLIPSTER DCI Mastering

system). This DCI Mastering system can then be used to load the DCP.

Although the self KDM carries a validity same as the other KDMs, with

the DVS DCI Mastering system you will be able to use the content

nonetheless even if the validity has expired.

Once a DCP is loaded with the self KDM, you can, for example, play it

out and check its content, create other KDMs (e.g. for later releases) or

modify it (e.g. exchange audio). Additional rendering/encoding pro-

cesses will only be performed where alterations were made, i.e. the

DCP will not be generated again completely.

This section describes how to use a DCP and a self KDM once they have

been created. It will be explained, for example, how to configure the

creation of a self KDM, how to load a DCP with the DVS software, how

to use a DCP to create additional KDMs, and how to modify a DCP

(e.g. for localized versions).

The self KDM is essential if you want to create new KDMs for

an already generated DCP.

DCPs can also be created unencrypted, for example, for trailers

or advertisements. Then, of course, they do not require KDMs

or a self KDM. Unencrypted DCPs as well can be used as de-

scribed in this chapter, but do not require a self KDM.

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DVS Clipster Guide de l'utilisateur Page 64