Why does youtube say author does not allow playback on iphone?

How do i change it? It says that on my videos.

It means what it means… The person who made the video and uploaded it agreed that it would not be allowed to be viewed on phones. It's as simple as that.

The video you get this on probably contains copyrighted material that has been claimed, thats why it has been disables on Mobiles and in some cases on TV and specific countries too

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