11 Aug
2014
11 Aug
'14
5:44 p.m.
On Thu, 7 Aug 2014, Ben Edwards wrote:
So for non encrypted SMPTE is playing safe?
If was encripted what is safest, maybe not answer that yet, when I need to do a KDM will
do some resurch and reread emails.
Lastly was wondering if I did one and it went to a more mainstreem release I assume a
company would handle the KDM thing. Do I just give them the whole file
structure rather than just the DCP directory?
As far as I can tell, the normal approach here is to send the distribution
company the (encrypted) DCP. They will give you a certificate for their
system, and you make a KDM for this certificate. That KDM gives them the
secret keys that encrypted the DCP so that they can make new KDMs
themselves to send to cinemas.
You could send them just the raw key (as is held in the metadata.xml) but
this is unsafe as if it were to be intercepted then the interceptor could
decrypt your DCP.
Carl
Ben
On 7 August 2014 19:03, Carsten Kurz <audiovisual(a)t-online.de> wrote:
Am 07.08.2014 um 19:49 schrieb Ben Edwards:
When I loaded the test DCP onto our server it seemed all the ones we have loaded
are interlop. They have IOP not SMPTE as penultimate thing in
the name thing in the name. Its a mixture of stuff like indy Tom on the Farm,
Finding Vivian Myer and Supermech (Mike Myers) but they all seem to
be IOP.
It's a bit more complicated than that - current commercial DCPs basically are all
Interop, but KDM, the KeyDeliveryMessage for encrypted content ran through
it's own format changes over the years. Wolfgang is right that 'classic'
Interop KDMs are outdated now, whereas the 'Modified Transitional 1' is, as the
name
says, a breed between Interop and SMPTE and aimed towards compatibility with both Interop
AND SMPTE DCPs.
DCP-o-matic supports no 'old style' Interop KDMs, but it does support Interop
DCPs - and if encrypted, they currently should be be used with the 'Modified
Transitional 1' KDM type.
This is all about playing safe - the specific projection system you are testing it on may
be ok with either version, but any other system may not. So stay
with these recommendations.
- Carsten
Ben
On 2 August 2014 09:08, Wolfgang Woehl <tito(a)online.de> wrote:
Carsten Kurz:
Also, DCP-o-matic has a choice of creating SMPTE
or Interop compliant DCPs AND KDMs - both need to fit either standard, and I suggest to
go the 'old' Interop way, that is, create an encrypted Interop DCP,
then create a KDM type 'Modified Transitional 1'
Tiny note there:
There are Interop and SMPTE KDMs. Interop KDM is deprecated. While you could find systems
which expect Interop KDM if you look very hard you need
to generate SMPTE KDM for both Interop and SMPTE DCPs.
Wolfgang
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Ben Edwards, Video Editor and Cameraman
web:www.nkytwig.com mobile:07773 02 44 82 skype:funkytwig twitter:@funkytwig
iContact Community Video | Bristol Community Channel