In short, this is likely the (or a similar restoration) converted into a digital file format for the best possible home viewing experience.
That string refers to a of the 1944 film noir classic Double Indemnity . Double.Indemnity.1944.BDREMUX.2160p.HDR.DVP8.se...
: This indicates it is a "remux" of a Blu-ray Disc. The video and audio data have been taken directly from the disc without being re-compressed, meaning it retains the original maximum quality of the physical media. 2160p : This is 4K resolution ( In short, this is likely the (or a
: Stands for High Dynamic Range , which provides better contrast and a wider range of colors. Double.Indemnity.1944.BDREMUX.2160p.HDR.DVP8.se...
: The movie title and its original release year.