Hi,
Paragraph 2G of the Apple iMovie software license states in part:
"The Apple Software contains media content including but not limited to graphics, audio clips, video clips
and/or templates (“Media Content”). This Media Content is proprietary to Apple and/or its licensors, and
is protected by applicable intellectual property and other laws, including but not limited to copyright.
Except as otherwise provided, all Media Content included in the Apple Software may be used on a
royalty-free basis in your own video projects but may not be distributed on a standalone basis (and
audio Media Content may only be used for your own personal, non-commercial use)."
You can read the entire license agreement by opening iMovie and clicking on iMovie/About iMovie/License agreement. The license agreement may have been updated in the most current iMovie versions, and if that is the case you should verify which license agreement applies to you.
You might try using You Tube instead of Vimeo to embed the video. If You Tube flags it for copyright often you will be presented options for conditional use, such as no monetary benefit, or restrictions as to region or country, or agreeing to ads, etc. Also, sometimes even though it may be flagged the copyright holder will allow unrestricted usage.
-- Rich