Yes indeed, your DVD player is making a copy in it's own RAM, then converting to a video stream for display on the TV. But your DVD player came with a software license authorizing you to play (copy/convert/stream) the movie.
Imagine a TV station playing a copyrighted movie -- their digital broadcast system will transfer copies of the (digital original of the) movie to several stages of subsystems before transmitting over the air. Perhaps inserting ads, or perhaps the ads were inserted an earlier time for a ready-to-play digital file.
Are they making unauthorized copies? (Presumably they have a license to broadcast the movie, but not to copy it, however ephemerally.)
ISTR this was an actual concern for the design and implementation of digital broadcast studio equipment.
Biting the hand that feeds IT
