Just open the program and select media then scroll down to open disk. Then under disk selection choose dvd then make sure disk device is on the dvd drive you want to watch and just press play at the bottom. Very easy and free fix, hope problem is able to figure out.
If still cannot play dvd movies, pls feel free to turn to
http://www.brorsoft.cn/rip-dvd/play-dvd ... s-mac.html, in that post, list another way to fix this problem using keys database and AACS dynamic library.
If you have problem about playing DVD, try to seach "brorsoft" or "brorsoft dvd ripper" or enter problem you eager to solve on google. Brorsoft studio provide simple and easy solution for dvd related problem, inclding ripping dvd, backing up dvd, converting dvd, copying dvd, etc