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 (

: The movie title and its original release year. Double.Indemnity.1944.BDREMUX.2160p.HDR.DVP8.se...

: This is a specific type of Dolby Vision metadata. Profile 8 is designed to be backwards compatible, allowing the file to play in HDR10 on devices that don't support Dolby Vision. : This indicates it is a "remux" of a Blu-ray Disc

: Stands for High Dynamic Range , which provides better contrast and a wider range of colors. : This is a specific type of Dolby Vision metadata

That string refers to a of the 1944 film noir classic Double Indemnity .

In short, this is likely the (or a similar restoration) converted into a digital file format for the best possible home viewing experience.