So I just wanted to watch a movie on my laptop. When I inserted the DVD was then with the folder can't be included, since it is on a removable medium. Can someone please explain to me what that means because my laptop when I put a movie in the drive not immediately, but somehow on Windows Media Player. Would be cool if synonymous me explains how it works if I want to watch a movie directly through Windows Media Player. By the way, Windows 10.
I have the experience of the Windows own media player has some internal functions that can cause such effects.
Deal with the VLC media player (free license), it does not need any additional codec driver files and can play audio like video.
Inform yourself on the Internet about it, as a basic info, see under https://www.chip.de/...90829.html
"Can someone please explain what that means to me…" It is about a copied file to CD, which is actually (copy) protected. ---- You could duplicate the CD and sell it commercially. A copied file from the Internet on your plate is indeed meant for your own consumption and maybe only once usable.
It seems to me that your problem is based on the topic "copy protection". So should be well known.