In the USA, people can use small portions of a published document under certain fair use conditions. Republishing an entire article
without permission is an infringement - whether they credited the source or not:
Quote:
Could I be sued for using somebody else's work? How about quotes or samples?
If you use a copyrighted work without authorization, the owner may be entitled to bring an infringement action against you. There are circumstances under the fair use doctrine where a quote or a sample may be used without permission. However, in cases of doubt, the Copyright Office recommends that permission be obtained.
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http://www.copyright.gov/help/faq/faq-fairuse.html#sued