The Dark Knight Trilogy 1080p Bdrip Aac X264-to... -

The ...to- suffix suggests a group like -RARBG, -DDR, or -ESiR. Historically:

The only way to legally own a 1:1 copy of the Blu-ray (the source of a "BDRip") is to: THE DARK KNIGHT TRILOGY 1080p BDRip AAC x264-to...

If you wish to convert the video to another format for compatibility reasons: The only way to legally own a 1:1