That information is going to be locked down tight. I have my suspicions, as a medical librarian, from knowing database vendors and knowing journal publishers. I am not an expert on these types of contracts, tho, and the folks who are usually are not allowed to talk about it. My random guess = Chances are the model is a bit complicated depending on how many views from which trigger source depending on whether institution of person clicking separately purchased access, etc. - Patricia F. Anderson
