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Author Topic: CPL signature check failed Amanda Mundin Expert Film Handler Posts: 122 From: Belper, Derbyshire, UK Registered: Sep 2005 posted 11-06-2012 02:56 PM                     We have been running a Doremi DCP2000 for about 6 years now and never seen this message before - CPL signature check failed. It brings up a screen that says press Abort to cancel the show otherwise it will automatically start in 5 seconds. The film is 'The Snows of Kilimanjaro' and is not encrypted. The film seems to run, it is running now, what does this mean and is it likely to stop half way through?  |  IP: Logged Frank Cox Film God Posts: 2234 From: Melville Saskatchewan Canada Registered: Apr 2011 posted 11-06-2012 04:31 PM                        A CPL is the "Composition Play List", which is defined as follows: quote: A text file that contains all of the information on how the files for a specific Composition should be played back, including how the audio and subtitles are synchronized with the picture. The CPL could contain one reel or many reels, and there are different CPLs for each soundtrack or version that would play back. The CPL is created by the Digital Cinema Packaging Facility From here It appears that your DCP (the file on the hard drive that you got from the distributor) is corrupted.  |  IP: Logged Amanda Mundin Expert Film Handler Posts: 122 From: Belper, Derbyshire, UK Registered: Sep 2005 posted 11-06-2012 04:45 PM                     The film seemed to run fine, picture, sound, subtitles etc. so whatever the error may be with the file, it must be a minor one  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 11-06-2012 05:49 PM                     I've seen this after upgrading the server software, what I was told by Doremi was that the KDM had errors that would be missed on previous versions, but the new version has more stringent security checks. That time the show refused to run, I had to revert to a previous version. You can run the show at least! What software, firmware, and SM versions are you using?  |  IP: Logged Ken Lackner Phenomenal Film Handler Posts: 1907 From: Atlanta, GA, USA Registered: Sep 2001 posted 11-06-2012 06:57 PM                     I know this isn't much help as to what this message means or what causes it, but I can tell you that I've seen this message before and it has not affected playback. I'm curious to its meaning, too. quote: Frank Cox It appears that your DCP (the file on the hard drive that you got from the distributor) is corrupted. Well, to be accurate, a DCP is actually a collection of files. A CPL is a single file contained inside the DCP. (On certain rare occasions, a DCP may actually contain multiple CPLs, although this is not very common.)  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 11-07-2012 03:31 PM                     I can't remember exactly now, but it has something to do with how the CPL is made, it's not actually corrupted. It says the same with some old Dolby test charts. The doremi just says that it does not follow some DCI requirements, but it's happy anyway!  |  IP: Logged Aleksandar Obradovic Expert Film Handler Posts: 125 From: Belgrade, Serbia Registered: Oct 2012 posted 11-11-2012 08:45 AM                     Like Marco said it is a problem with wrapper or DCP creation software not your Doremi. i've seen this message and similar ones and always wrapper was a reason. i can tell that you are lucky because you had issue with cpl that can work. i had same problem with kdm's and lost few great shows because of distributors mistakes. note that my servers running latest SW/FW/SM versions  |  IP: Logged Wolfgang Woehl Film Handler Posts: 31 From: Munich, Germany Registered: Apr 2012 posted 11-11-2012 10:59 AM                        Amanda, would be great if you could post the CPL in question (Content Manager > Actions > Export CPL). The answer to your question might be quite different from what has been suggested so far. Anyway, the fact that the machine offers "Ignore" and that playback is fine and complete tells you something about a signature's value in Interop context: It's approaching zip. Interop systems have no way of enforcing a composition's (CPL's) signature in the first place. The implications should be obvious, see Our Interop DCPs are working just fine. Why should we switch to SMPTE DCP again?  |  IP: Logged Joel O'Brien Film Handler Posts: 2 From: South Melbourne, Victoria, Australia Registered: Jun 2012 posted 11-11-2012 10:53 PM                     Hey there guys, May I suggest that you require Level 2 Modified Transitional 1 KDM's. The new projector handshake along with various recent firmware updates has made this all very painful but by the sounds of it you need a KDM with no ContentAuthenticator and has the assumed trust thumbprint in it. Hope that helps...  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 11-12-2012 10:38 AM                    quote: Amanda Mundin The film is 'The Snows of Kilimanjaro' and is not encrypted. Since the content she is playing is not encrypted, a KDM is not required.  |  IP: Logged Joel O'Brien Film Handler Posts: 2 From: South Melbourne, Victoria, Australia Registered: Jun 2012 posted 11-12-2012 05:15 PM                     Ahhh my mistake. Well I'd have to agree with the above then... or it could be an older SMPTE phase it was made against during the DCP's ...  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 11-12-2012 07:40 PM                     Sorry I was confused about KDM and CPL. The problem I had with "signature checks failed" may have refused to play because it was encrypted. Possibly a non-encrypted CPL would play with the error. Anyway, I think the CPL is incorrectly produced. This doesn't cause a problem with rather outdated server software/firmware but recent - and particularly DCI compliant versions - are much more stringent checking every detail of the CPL.  |  IP: Logged

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