Can you put a DVD in an XBOX one?

There's a Bluray drive there, can you also insert a DVD there without breaking it?

Yes. Load and play. No problem.

Something doesn't break either she reads it or she doesn't and spits it out again

I can watch every DVD on my Xbox One as normal.

The blueray drive is backwards compatible. I.e. It reads everything from normal audio cd to mp3 cds, cd roms, dvd-rom or dvd…

I see the biggest problem in the licensing question, so may the xbox play dvd because microsoft paid for it or shouldn't it?

but I think yes, in the worst case the dvd would not work. Nothing can break.