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Author Topic: CLASS ACTION SUIT... please Mitchell Dvoskin Phenomenal Film Handler Posts: 1869 From: West Milford, NJ, USA Registered: Jan 2001 posted 05-24-2017 02:43 PM                     The issue is not that there is a kill switch, but that the purchasers were not told it was there, and that it could be activated (or extended) at the whim of the manufacturer.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-24-2017 02:48 PM                     These aren't kill switches, per-say. They are expiring certificates. I don't know the rules and regulations on certificate duration to be compliant with whatever FIPS rules or DCI rules are required. TI had an early expiration date on their 3D feature for series 1 projectors. By updating to beyond TI 13, it kicked it WAY out to "3D expires 04 JUL 2129". That clearly is a sufficiently long time that nobody will mind when the 3D feature doesn't work then (except maybe collectors of ancient movie projection apparatus/museums). However, that was a feature, not a security certificate.  |  IP: Logged Mike Renlund Film Handler Posts: 71 From: San Francisco Registered: Feb 2008 posted 05-25-2017 01:54 PM                     Dolby Media Block certificates are available at ftp.cinema.dolby.com. You can download and check the certificate expiration date. The first DSP100 certificates expire in 2031, with the last ones expiring in January 2040. Mike Renlund Dolby  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-26-2017 06:12 AM                     Thanks for the clarification Mike! So, it would appear, the certificate in the DSP100 gets you about 40 years (presuming the last expiring one is related to the last unit produced and the first expiring one is related to the first one produced. 40-years! Is it reasonable to presume any of this equipment will be running in 40-years? Is it reasonable to presume that the standards for digital cinema (for which it will just be called cinema, presuming cinemas are around then)? Does anyone think that whatever battery device used to retain that certificate will be functional by then too? I'm curious, can you answer if there is some sort of rule/regulation/requirement as to how long a certificate MAY last?  |  IP: Logged Greg Routenburg Expert Film Handler Posts: 178 From: Toronto, ON, Canada Registered: May 2003 posted 05-26-2017 11:26 AM                     For the DSP100s, that sounds quite reasonable.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 05-30-2017 06:56 AM                     quote: Steve Guttag I'm curious, can you answer if there is some sort of rule/regulation/requirement as to how long a certificate MAY last? There aren't really any cross industry guidelines or regulations on certificate expiry dates. Some industries have their own regulations and guidelines regarding specific implementations. The consensus seems to be that the expiry date has to be based on the use case. If a certificate cannot be easily revoked for example and the expiry date is important for access control, then you obviously should go for a rather short period. For stuff that should last longer, like root certificates, intermediate certificates or device certificates, best practice seems to be to make a reasonable assumption of what the expected time-frame will be, in which the underlying private key will still be secure, given its strength. A period of 40 years should be more than reasonable for any digital equipment. I'm not sure if we can make an accurate prediction of what computing would look like in 40 years though. If anybody invents a working quantum computer with sufficient amounts of qubits in the meantime, RSA and ECC will become obsolete immediately. Still, I think manufacturers should be more forthcoming in opening up a platform in any reasonable way, after it's been abandoned by them.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-30-2017 11:35 AM                     quote: Steve Guttag Does anyone think that whatever battery device used to retain that certificate will be functional by then too? Isn't it reasonable to assume that if the battery should go dead you just replace it and then reinstall the certificate again? This is something that on a GDC, can only be done at GDC and why it is important to replace the certificate batteries in your GDC's in a timely manner. Mark  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-01-2017 07:21 AM                     I never even tried looking at them so closely, but I guess it wouldn't be too complicated to find a jumper near the battery, or dig up the traces to testpoints, etc., so to bridge the old battery with a backup supply of the same type, then swap the on board battery. Sure the better idea than to let the board die wittingly. Just set up a strategy in time for all occuring boards/battery types. - Carsten  |  IP: Logged

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