iMovie Trailer templates; are they copyrighted?

i need advise:

posted following video on youtube,

http://youtu.be/npchjsaic_g

, youtube showing me this:

video may include following copyrighted content:

"promo miss cognati vs g-dubb chellios", audiovisual content administered by:
dance day

assumed apple not include third party (or own copyrighted material) copyrighted material creation of these imovie trailers, not know advise or do.

ideas????

 

that's in imovie!?

 

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