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Topic: Make KDM for encrypted DCP

Michael Qu
Film Handler

Posts: 43
From: shanghai shanghai china
Registered: Jan 2012

posted 12-03-2014 09:14 PM

quote: Carsten Kurz
Michael - the 'raw' key that is used to encrypt the DCP, and which is used to create the KDM afterwards, is stored with the other project definition in the metadata.xml file. You can look it up there if you want.

So this stays safe on your computer, if you don't accidentally copy it with the DCP to a distribution drive. If you lose it, delete the project file/folder, etc., you will not be able to create another KDM for this particular DCP/CPL.
You would have to create the full DCP from scratch incl. encryption with a new key.

To create KDMs, you will first need to create a database of certificates/screen/theater references within DCP-o-matic. When creating a KDM for a specific screen, you will link this screens/servers certificate with the CPL you created, then either store the KDM file locally or set up an email chain to send it directly to the theater/projectionist.
This KDM is then only valid for that particular screen, and within the given time frame you set. DCP-o-matic will create this time frame based on your local machine timezone settings. So if you let the window start at 9am, this will be YOUR 9am. As long as your DCP doesn't cross timezones, you can ignore this.

Thanks Carsten,I understand it now. [beer]

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System Notices
Forum Watchdog / Soup Nazi

Posts: 215

Registered: Apr 2004

posted 08-28-2018 05:08 PM

It has been 1363 days since the last post.

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Cameron Glendinning
Jedi Master Film Handler

Posts: 845
From: West Ryde, Sydney, NSW Australia
Registered: Dec 2005

posted 08-28-2018 05:08 PM

Can you generate KDM's for DCP's authored and encrypted on other software like Clipster, through Dcp O Matic?

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Carl Hetherington
Film Handler

Posts: 93
From: York, North Yorkshire, England
Registered: Jul 2012

posted 08-28-2018 05:54 PM

quote: Cameron Glendinning
Can you generate KDM's for DCP's authored and encrypted on other software like Clipster, through Dcp O Matic?

Yes, so long as you have a DKDM for the encrypted DCP.

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Cameron Glendinning
Jedi Master Film Handler

Posts: 845
From: West Ryde, Sydney, NSW Australia
Registered: Dec 2005

posted 08-28-2018 08:09 PM

Thank you Carl.

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Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999

posted 08-29-2018 02:58 PM

Is there a chart showing the specific abbreviations used in the DCP name that identifies the movie title, picture and sound formats etc., and the order they are supposed to be listed when giving the DCP name? Is the DCP name with those specific abbreviations, generated by the DCP authoring software or does it the name need to be created manually?

Secondly, can a KDM be authored so it will have a start and stop dates and times, but not necessarily required to have the private key of the projector, in other words, it can be played anywhere on any projector but restricted to within that specified time frame?

If a DCP has multiple items in the playlist, say a film festival with a program of multiple shorts, is it possible for the projectionist (or rather I should say the "server operator") to manually pause between items on the playlist as the show is running and how easy or difficult is it?

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Carl Hetherington
Film Handler

Posts: 93
From: York, North Yorkshire, England
Registered: Jul 2012

posted 08-29-2018 03:49 PM

quote: Frank Angel
Is there a chart showing the specific abbreviations used in the DCP name that identifies the movie title, picture and sound formats etc., and the order they are supposed to be listed when giving the DCP name? Is the DCP name with those specific abbreviations, generated by the DCP authoring software or does it the name need to be created manually?

DCP-o-matic does it for you, or you can consult The ISDCF's page

quote: Frank Angel
Secondly, can a KDM be authored so it will have a start and stop dates and times, but not necessarily required to have the private key of the projector, in other words, it can be played anywhere on any projector but restricted to within that specified time frame?

Not so far as I am aware. If a KDM could be decrypted by anybody then anybody could make new KDMs with different start/stop times.

quote: Frank Angel
If a DCP has multiple items in the playlist, say a film festival with a program of multiple shorts, is it possible for the projectionist (or rather I should say the "server operator") to manually pause between items on the playlist as the show is running and how easy or difficult is it?

I've only used Doremi servers, and you can on those (just hit pause on the control panel).

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 08-29-2018 04:05 PM

The operator may use the pause button on the server screen, or, most servers also support remote control options for transport, such as, a button, or network/serial command. Often also an interface on a wireless connected phone/tablet/notebook is possible.

- Carsten

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Jim Cassedy
Phenomenal Film Handler

Posts: 1661
From: San Francisco, CA
Registered: Dec 2006

posted 08-29-2018 04:55 PM

quote: Frank Angel
is it possible for the projectionist (or rather I should say the "server operator") to manually pause between items on the playlist

On some equipment (such as Doremi & Christie) it's also possible to build an
"automatic" pause into a playlist, so that it will pause without operator
intervention. I am right now working at a large film festival and am in
the process of creating a number of such playlists with auto-pauses.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 08-30-2018 06:40 AM

...and of cause the difference between pause and stop on these systems is that the current image is freezed on screen in pause mode. This may be desirable (black, or a festival logo), or not.

- Carsten

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Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999

posted 08-30-2018 10:01 AM

Many thanks, guys. The film school rents a local theatre to show their end-of-year "film" festival of a few dozen Film Major student and Masters theses films, and this year I will be trying to convince them to author DCPs to hand to the projectionist rather than a stack of BluRays (knowing what showing non-standard formats entail for the projectionist). I just want to bone up on the DCP authoring process.

Is there a "standard" hard drive that the distributors send to the theatres? We want to give the projectionist what he normally sees rather than something unusual.

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Carl Hetherington
Film Handler

Posts: 93
From: York, North Yorkshire, England
Registered: Jul 2012

posted 08-30-2018 01:26 PM

Commercial operations (in the UK at least) usually use some variation on this.

They're quite expensive though. A USB hard drive (ideally with a power supply) would be fine.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 08-30-2018 02:26 PM

Frank, I'd simply create two or three short test DCPs - one flat, one scope, one 16:9, copy them to an NTFS formatted USB drive, and give them to that theatre for a test beforehand. Most operators prefer CRU drives, but there now many servers that have no direct CRU/SATA ingest option at all, and so they do everything through USB2/USB3.
While ext2/3 is the official format, no current server has issues with NTFS.

- Carsten

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