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Author Topic: Question About KDM's Expiration
Bradley J Sime
Film Handler

Posts: 53
From: Edmonton, Alberta, Canada
Registered: Apr 2016


 - posted 03-07-2018 08:09 PM      Profile for Bradley J Sime   Author's Homepage   Email Bradley J Sime       Edit/Delete Post 
We have a film beginning at 9:30 tonight with keys set to expire at 11:59. If the keys expire while the film is playing, what happens? Does it cut out right away, or does the film finish?

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Carsten Kurz
Film God

Posts: 3582
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 03-07-2018 08:13 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
There is a maximum time window of 6 hours beyond the KDM expiration during which a show will not stop IF started before expiration.

So, if your keys expire at 00:00 midnight, and you started the show (playlist) at 23:59, you will be able to play the show to end up until 06:00.

I tested this on two different servers, starting a show just before the KDMs expired, and leaving it in play/pause mode. If you STOP, then try to restart, you are burnt.

Not all servers may follow the 'pause' mode extends expiration scheme. But, in your case, you should be safe. Extra check your KDM on the server in order to be sure that the correct timezone is applied.

- Carsten

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Bradley J Sime
Film Handler

Posts: 53
From: Edmonton, Alberta, Canada
Registered: Apr 2016


 - posted 03-07-2018 08:14 PM      Profile for Bradley J Sime   Author's Homepage   Email Bradley J Sime       Edit/Delete Post 
Thanks, man!

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Max Hayman
Film Handler

Posts: 16
From: London, England
Registered: Jan 2015


 - posted 03-12-2018 10:38 AM      Profile for Max Hayman   Email Max Hayman   Send New Private Message       Edit/Delete Post 
You can, although i don't recommend it shift the time on the server a bit. Our server shifted a few hours before we hooked it up to a NTP server.

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Carsten Kurz
Film God

Posts: 3582
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 03-12-2018 10:52 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
DCI compliant systems only allow to adjust the secure clock within +/-6min per year through the operator. Larger adjustments are possible, if authorized by the server manufacturer on a case-by-case basis. You need to call your manufacturer support to receive a code, DLM, etc. to allow this.

The secure clock is the one actually being used for the KDM validity window.

Your server/show manager may use a time that is not synced with the secure clock. While you may schedule a show based on the show manager clock, the feature will not play if the secure clock doesn't match the KDM validity window.

Even if you configure an NTP server on your system, the secure clock will not follow the NTP further than the allowed +/- 6min per year. Larger deviations will be ignored.
Your show manager clock, though, is allowed to follow larger NTP offsets.

Secure clock and KDMs are all referenced to UTC. Your server will typically adjust time display to your local timezone configured on the server. As such, adjusting the time zone will not allow you to play a feature earlier or later.

- Carsten

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