Not all theatres with digital projectors have access to the bandwidth necessary for direct transmission of the master files. They receive their copies on encrypted disks via courier. Regardless, the local medium is a hard drive. How the data gets onto it is irrelevant. The system is far more fungible than analog hard copy.
Originally Posted by SilverGlow
The error rate of digital files is there, but infinitesimal *if* a master of 100% fidelity is properly copied.
And check sum logic scans *do* find errors, do they not? And guess what? Some are fatal errors because there was an error with the "master", which may or may not be the authentic master. For archiving, there is a chain of authenticity.