AllExperts has a zero-tolerance policy on plagiarism and copyright infringement. All outside content must be credited. Click here to for Harnack & Kleppinger's Guidelines for Citing Sites. Volunteers caught plagiarizing will be terminated without warning.
Wikipedia defines plagiarism as:
"the use of another's ideas, information, language, or writing, when done without proper acknowledgment of the original source"
Plagiarism occurs if a volunteer passes off another person's text, images, or multimedia as their own.
Plagiarism is not the same as copyright infringement.
Wikipedia defines copyright infringement as:
"the unauthorized use of copyrighted material in a manner that violates one of the copyright owner's exclusive rights, such as the right to reproduce or perform the copyrighted work, or to make derivative works that build upon it."
By volunteering, you agree to respect copyrights and trademarks when answering questions. When in doubt, ask permission. If you are unsure of the copyright status of any material and/or you can't contact the owner for permission - do not use it.
Creating links to other sites isn't a problem, providing you don't misrepresent their work as your own.
Short quotations from or references to other people's work are fine, so long as you attribute your sources. But never use substantial chunks of other people's work without securing permission and clearly identifying the author. Citing sources not only protects you from plagiarism charges; it also enhances the quality of the information you supply and your credibility.
Works in the public domain may be used freely without the permission of the former copyright owner - but they must still be cited. A work of authorship becomes "public domain" when it no longer meets the requirements of copyright protection. Click Here to read Wikipedia's explanation of public domain.