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 Wolfgang is right that 'classic' Interop KDMs are outdated now, whereas the 'Modified Transitional 1' is, as the name says, a breed between Interop and SMPTE and aimed towards compatibility with both Interop AND SMPTE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@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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