Looking at the question on teleportation, there is this answerthis answer that appears to quote a body of text from PHB3. I don't actually own that book, so I couldn't check it out. But that got me thinking about copying text from sources that are not freely available online. How much quotation from published material is too much? Is there a good rule of thumb? Do we need to be on the lookout for it?
Followup question: If we do need to worry about it, is that a good reason to use the flagging system?
