Is framed content on another domain duplicate content?

[cakelady]

I've read a number of articles and am getting opposing answers. I've been checking pages of Photo.net in copyscape for duplicate content. I'm finding a number of domains have the site iframed onto them. I was wondering why copyscape could read the content if the search engines supposedly didn't crawl iframes. Copyscape said Google can read the content.  I just want to know if these sites need to remove the iframe (is it hurting Photo.net)? Thanks.

Examples:

http://www.copyscape.com/?q=http%3A%2F%2Fphoto.net%2Freviews%2F

[DavidKonigsberg]

Rule of thumb is that iframe content isnt duplicate content -They may see it but they count you as the source.