MakeMKV is a freeware to convert video that you own into free and patents-unencumbered format that can be played everywhere. MakeMKV is a format converter, which called “transcoder“. MakeMKV converts the video clips from proprietary (and usually encrypted) disc into a set of matroska video files, preserving most information but not changing it in any way.
The MKV format can store multiple video/audio tracks with all meta-information and preserve chapters. There are many players that can play MKV files nearly on all platforms, and there are tools to convert MKV files to many formats, including DVD and Blu-ray discs.
MakeMKV can instantly decrypted video without intermediate conversion so you can watch Blu-ray and DVD discs with your favorite player on your favorite OS or on your favorite devices.