One of the main reasons why fewer people use DVD now may be that there is no corresponding playback equipment. DVD players at home have been eliminated. If we want to play discs, we usually plug in the CD-ROM drive that comes with our notebook or computer, but now many computers have no built-in CD-ROM drive in pursuit of thinness. Every time I want to watch a disc, I face many difficulties, such as no equipment to play it or the disc has copy protection, etc. Some software can copy protected DVD, but there are some free software, but it can’t crack all copy protection.