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Author
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Topic: Duel Sets of Keys
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Jim Cassedy
Phenomenal Film Handler
![](http://www.film-tech.com/ubbmembers/4115a.jpg)
Posts: 1661
From: San Francisco, CA
Registered: Dec 2006
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posted 03-18-2015 10:18 AM
I had something like this happen for a special screening last year.
In my case, I discovered the 2nd set of keys in my inbox right after I had ingested the first ones.
When I attempted to ingest the 2nd set, the serverthingy (Dolby) said that those keys were already 'existing' and didn't process the 2nd set.
So, I'm ASSUMING that even though they came from a different sources, if the CPL's, UUID's, Feature Versions, Validity Dates, etc match- - it probably doesn't make a difference where it came from.
I know I've also gotten keys where the validity times were different. Because most of what I do are special screenings, my keys are usually only good for less than 24hrs. Sometimes I've only got a 2 or 4hr window!
On one occasion, I received 2 keys within a several minutes of each other and the only difference I could see was that one expired two hours later than the first one.
The system (Dolby) ingestified both, and simply extended the expiration period by two hours.
(Some studios or distributors seem to have different departments that issue KDM's for special screenings separately from the theatrical ones. I think sometimes there's some overlap or mis-communication & I get KDMs from both. They're usually identical, just from different sources)
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 03-18-2015 11:16 AM
Note: KDMs carry an issue date, e.g.
<IssueDate>2015-03-17T13:05:15+00:00</IssueDate>
Official DCI/SMPTE policy is that the key issued latest will take over. We had it quite a few times that we received two KDMs with different time windows for the same feature. When you ingest both, you won't have a playout window framed by both keys added together, but only that of the key issued later. We recently received a key for 'Magic in the Moonlight' with a playout window:
--- Key Start: 2015-03-04T18:00:00 --- --- Key Stop: 2015-04-02T23:59:00 ---
two weeks later, we received a second KDM:
--- Key Start: 2015-03-05T00:00:00 --- --- Key Stop: 2015-03-12T23:59:00 ---
If we'd ingested both keys, we would only have been permitted to play from 2015-03-05 to 2015-03-12 - the playout windows are NOT added! If for some reason you want to benefit from an earlier window start, you have to ingest that KDM first, and only ingest the second KDM after the first one has expired.
It didn't make a difference for us, so we didn't bother to ask why this happened. It wasn't the first time, but so far our effective booking date was always within the window of both KDMs.
If you received two KDMs from two different issuers, you won't have trouble ingesting both, but again, the KDM issued latest will take over the moment you ingest it. That is, per DCI/SMPTE specs. Don't know wether all servers handle this strictly in all software releases.
It is possible that, even coming from different senders, that both KDMs are 100% identical - in that case the server will simply not ingest the second as mentioned above. If the second KDM have actually been created for a different encrypted version of the same feature made by a different mastering facility, the server will simply consider this KDM as one for a completely different movie. It will ingest, but never be used and usually be purged automatically after a while. I don't think any of these scenarios could actually bring harm.
- Carsten
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