Please, Don't Steal Knowledge
What is knowledge theft? When does it happen? Knowledge thefts happen when someone else's takes your idea, or your knowledge, or your practice, or your materials and passes it off as their own. You know what? People hate that very much. If you want to contribute something or share something that is not yours make sure you reproduced with acknowledgment.
As Terry Pratchett says in "Unseen Academicals", its a short step from Adopt, Adapt, Improve to Steal, Use, and Look Innocent.
Knowledge sharing and reuse is great...