j1clark@ucsd.edu
Veteran
The first digital films were indeed delivered by hard drive. They were in some file format for the projection system.
Modern systems do deliver via satellite and/or some kind of hard line(DSL/ISDN). I'm not sure many use physical formats anymore.
Either way, a technician has to put the file on the server in the correct way. The files are encoded in an encrypted copy protection scheme (all according to the document I linked to). It does not say if a modern digital projector can play a non-encoded file.
In my look into this, the 'projectors' that are used in the local digital theater chain, take in two DVI connections. So, whatever 'server' has to process the data to the point of DVI output that goes directly into the projector.
Since one of the theaters in the chain, nearest my house, has a monthly 'film friends' presentation of a set of films, my presumption is that this group brings a DVD/BLURAY disk to the theater and has the projectionist load it up for viewing. Another theater in the chain hosts a 'yearly' film fest, and the media that was asked for by the fest management was either DVD or BLURAY. I had a showing there, but it was not on a 'big screen'...