You can play Blu-ray discs (regions A, B, and C), DVDs, and 4K/HD video files without paying a cent or entering a key.
If you only want to watch movies, ignore the "Register" button. The free version provides high-quality audio (DTS, Dolby, TrueHD) and 4K video support without any hidden costs.
Most sites promising "100% working keys" package them with installers that can infect your PC or Mac.
Searching for "better" registration codes or "keygen" files on third-party sites often leads to several problems: