No one is telling you not to share any information you may have come across, just when you copy something to credit the people that took the time to write it, in this case the essay you posted was written by:
The Man Child
Also - information taken from ironmaster posts
If you do not do this you give the impression that the work is yours. Surely you can understand if someone copied word for word a project you spent many hours working on without giving you credit you'd be pissed off, and rightly so.