What do you mean? All three of those are already digital, no conversion needed. Or do you mean you just want to copy them to some other storage medium?
"Digital" has become this weird overloaded term with a second meaning that means "no physical media". You see it mostly in videogames, "bought digitally" means buying it from Steam or another online store as a download, as opposed to a physical disk.
Obviously you're right and and literally every commercial* videogame ever released is digital in the sense that it's binary information, and the movies that person was talking about were already digital on Blu Ray.
You can kind of justify it as literally correct if you infer the context of "digital" referring to the method of transferral, rather than the method of information storage - I.e when I bought a game disk from a shop, the game was transferred to me physically on a disk, but when I bought one from Steam it was transferred digitally. Doesn't really apply as much for this situation tho.
(*I almost said every videogame ever made, but I suppose Tennis For Two and some other experimental games ran on analogue computers)
