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The following site is huge in the movie trailer industry:

http://bit.ly/18B6tF

It ranks #3 in Google for "Movie Trailers" and has high rankings for multiple other major keywords in the industry.

Here's the thing; virtually all of their movie trailer pages contain copy/pasted content from other sites. The movie trailer descriptions are the ones given by the movie companies and therefor the same content is on thousands of websites/blogs.

We all know Google hates duplicate content at the moment... so how does this site get a away with it?

Does it's root-domain authority keep it up there?

I own a funny video site that is getting about 1-4 of it's videos embedded on various sites daily.

In todays form, is widget link still acceptable?

This would show up under the video embed.

Example: Funny Dog Video From Site Brand

Or is it best nowadays to just have

Video Provided By Site Brand