The exact details areavailable in a support article.
Plex tells us that its video rentals use the H.264 codec and stream at a maximum 1080p resolution.
The maximum bitrate is 6Mbps, which is comparable to the bitrate of other services.
Some titles will stream with Dolby Digital+ 5.1 audio, but Dolby Atmos isn’t offered at this time.
you might watch the movie as many times as you want throughout those 30 days.
These terms are identical to what Google TV, YouTube rentals, and most other platforms support.
So, what’s different with Plex rentals?
Notably, it looks like you might only really rent movies, not buy them.
The rentals option is rolling out, and it might take a few weeks for it to reach everyone.
Source:Plex,Plex Support
