Uh, no? It assumes a effectively finite universe (perhaps with something like the speed-of-light limit rather than strictly finite, but effectively). It can be

Uh, no? It assumes a effectively finite universe (perhaps with something like the speed-of-light limit rather than strictly finite, but effectively). It can be infinite in time if you're okay with your compressed data potentially being somewhat larger the later you compress it, but that's not strictly necessary.