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Does UM have an understanding with these sites about the articles -- or are they being stolen and used inappropiately?
We don't give permission to anyone else to copy our columnist articles, these are copyrighted to the columnist who wrote them and only they can give permission to have it posted elsewhere, I won't give someone else permission on their behalf.
I have actually seen a few of our columnist articles being featured on sites such as Coast to Coast AM, but they only publish the first couple of sentences and then link to the full article, which is beneficial as it sends more visitors to the article.
There is such a thing as "fair use" for republishing copyrighted material, this comes in to play when copying part of an article such as a news story for commenting or news reporting purposes, which is why members can do that on the forum and we can post news stories on the front page, but at the same time this only applies if a reasonable amount is copied - again this is why we chase people up who copy and paste massive articles in their entirety or don't include a source link.
If a site is only copying a small amount of an article and providing a source link then that's generally acceptable and usually beneficial, however if they are reproducing your entire articles or not providing any kind of source information then that's plagiarism and you definately have a case for requesting the material be taken down.