Did something change since I was in college? I remember professors handing out copied print outs from books for studying specific subjects - sometimes it would be identified where the information came from and sometimes not. At the college I went to there was a sign stating that if the copies were used for educational purposes - in regards of study - it was free to be used. Though, it was a long time ago and I may be remembering wrong. Isn't this the same if we post stuff within a discussion? Though, I'm in a habit of showing where my information comes from in case a student is curious to learn about it more.