To avoid clutter, the only thing we should know is that we can’t say AirPlay DVD is illegal for private use, but for commercial purposes, ripping, recording and sharing the DVD content is absolutely illegal. You may wonder whether it is illegal to decrypt the copyright protection to achieve Airplay DVD. Someone said on the forum that he moved from one country to another and took DVDs with him, he is confused that DVDs cannot be played on the region-locked DVD player, and does this mean that he has no right to watch the DVDs although he bought them?Well, the answer won't be the same if you ask different people.

As long as your AirPlay request hits a wall in either of these two, you cannot enable streaming DVD from Mac to Apple TV. On the one side, the default DVD player installed on MacBook doesn’t support playing copyright protected or multiregional DVDs, and on the other side that the AirPlay unencrypt the video while streaming and that is in violation with Digital Right Management rules.

Another reason that you cannot AirPlay DVD is the copyright protection.

Apple dvd player gray screen