Subtitle Avatar.ece.2009.720p.brrip.x264.bitlok... -

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:

The video resolution (1280 x 720 pixels), which is standard high-definition. subtitle Avatar.ECE.2009.720p.BrRip.x264.bitlok...

Short for "Blu-ray Rip," meaning the file was encoded from a retail Blu-ray disc source. The string refers to a specific digital release