lktknow

I wasn't sure where to put this as it is a question about posting. The answer is most likely in the "rules of posting" but to cut to the chase, could someone please explain to me about posting copyrighted material, and how do you know if it is copyrighted.
I was chastised once here in the forum for posting something, and now in another forum I go to, my post was edited and the article taken out of the post. I gave the link to the article, but posted the article also.
I apologize for my ignorance in this matter. Thank you

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