The string refers to a specific digital release of James Cameron's 2009 film Avatar . Each part of this label provides technical details about the video file:
Short for "Blu-ray Rip," meaning the file was encoded from a retail Blu-ray disc source. subtitle Avatar.ECE.2009.720p.BrRip.x264.bitlok...
The video resolution (1280 x 720 pixels), which is standard high-definition. The string refers to a specific digital release
The video compression codec used to keep the file size manageable while maintaining quality. subtitle Avatar.ECE.2009.720p.BrRip.x264.bitlok...
The title and original release year of the film.