At the most basic level, a digital media file (document, song, video, etc) is just a rather large pattern of 1's and 0's.
We can say that for any given piece of digital media, there corresponds a binary "fingerprint" unique to said media which defines it.
For example, an MP3 of a song will have a very specific binary pattern, that if altered, results in the file no longer being the same song.
Armed with this knowledge, it seems feasible to generate a binary pattern which results in a new (or copy of existing) media.
This leads one to conclude that all digital media already exists, but just has not been stored in format yet. All possible binary patterns must be discoverable or are already known.
Taking the thought experiment a little farther, it would seem possible to generate a pattern for content not yet produced, say an upcoming movie that's still in production.
Assuming every piece of media has a unique binary "fingerprint", how realistic is it to produce a binary pattern which is consumable in some media form?