Here, you can download a wide selection of technical white papers prepared by the various Technical Working Groups of the Blu-ray Disc Association. Below you will find several general white papers related to the Blu-ray Disc format.
Blu-ray Disc Read-Only Format - HEVC video streams
for BD-ROM V 3.0 (June 2015)
Blu-ray Disc Format - General (December 2012)
Blu-ray Disc Format - File System Specification