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Author Topic: Erased the DCP O MATIC file, can I still make up a KDM? Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 10-11-2018 11:58 PM                     I just realized I have erased the DCP O MATIC programme file, I have kept the encryption code numbers involved as a text file. Is it somehow possible to make up a new KDM for the DCP that I have stored on a hard drive?  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 10-12-2018 11:22 AM                        quote: DCP-o-Matic Manual You must be careful when using encryption not to lose important keys. If you are making KDMs from a DCP-o-matic film you must ensure that you have a backup of the metadata.xml file from the project, as well as the DCP itself. If you are using a DKDM you must ensure that you have a backup of DCP-o-matic's config.xml file, since it contains the only key which can decrypt the DKDM. The config.xml file location depends on your operating system; possible locations are listed in Chapter 18, Configuration files  |  IP: Logged Ioannis Syrogiannis Expert Film Handler Posts: 147 From: Reykjavík, Iceland Registered: Jun 2005 posted 10-12-2018 11:28 AM                     Wouldn't that have a faster answer in the DCP-o-matic forum? You can head to dcpomatic.com and click on help, then follow the forum link. For some reason, the forum link is not on the first page... P.S. Leo gave a full response while I was searching the way to not use a link...  |  IP: Logged Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 10-12-2018 04:03 PM                     Thank you for the reply's, I kinda knew I was wishful thinking when I posted but it was worth asking .  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 10-12-2018 04:12 PM                        As others have said, the DCP-o-matic forum would probably get you a quicker answer! What do you mean by "encryption code numbers"? You might be able to make a KDM with them, depending on what they are...  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-12-2018 05:58 PM                     Cameron - you may have erased your DCP-o-matic installation, but your config file including the certs is probably still there. Do you still have the project directory where the encrypted DCP was created? - Carsten  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 10-12-2018 05:58 PM                     What, exactly, did you delete? If you simply deleted the application file but not the prefs/settings folder(s) then you should be able to find those folders, temporarily rename them, reinstall the application then move the original files back to their rightful place and you should be okay. Think of what you would have to do when you want to reinstall an application like Firefox without losing all your bookmarks, passwords and settings. The process would be similar. However, if you deleted everything, including your prefs folder, you will have a tougher problem to solve. You’ll have to recover all your encryption keys and reinstall them before you can encrypt files or play back encrypted files. If you can’t recover your keys, you’re basically hosed.  |  IP: Logged Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 10-14-2018 04:06 PM                     Hi all I have only created one file that needed a KDM, I still have DCP O Matic as working software on my computer. I kept the file that actually ingests and plays in the projector but erased the rest of the files for that project. I did keep a text file of the actual code used for the encryption which I suspect is worthless.  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 10-14-2018 05:50 PM                        What do you mean by "actual code used for the encryption"? The 32-digit code from the metadata.xml?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-15-2018 03:51 AM                     I guess he wrote down the encryption data string that he either input or had generated manually under the DCP tab (and that went to the - lost - metadata file). So, technically, he has everything he needs to decrypt that DCP, but which tools will allow him to create a KDM from that? asdcplib will allow to decrypt the assets using the raw key, but that process is a bit cumbersome. Can he create a fake metafile for an encrypted DCP and edit that key into it? Then how can he assign the CPL/UUID of the existing DCP in order to see it as target for KDM creation? - Carsten  |  IP: Logged

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