Actually, the problem is posting ('ripping') the article from another site and reposting it without expressed permission is the problem. Credit or no credit given. Posting a summary + link is accepted. Been dealing with this for a couple of years now.
From the ultra-simple wikihow.com:
"Examples of "fair use" are excerpts of a copyrighted work, such as:
-A one or two sentence summary of an article. Just enough to give a working idea of the content. Full paragraphs and embedded objects are not included."
Some of the major newspaper publishers and some broadcasting companies hired law firms to issue orders against bloggers and other sites to stop re-publishing stories and articles without permission. Some sites were not even given this warning, just hit with a suit.
Our policy here is no full articles. Links are good to go.