I wasn't primarily thinking of making things free, that is obviously not always possible. What I argue against is introducing artificial and superficial restric

I wasn't primarily thinking of making things free, that is obviously not always possible. What I argue against is introducing artificial and superficial restrictions, in the form of restricting GUI actions. This gives a false sense of security, because the underlying data is still on the user's computer and technically they can do whatever they want with it. Instead I believe the system that you talk about should rely on trust, something which cannot be established by technical means. Yes you could require the user to scroll through the whole document, even require a minimum of x seconds per page, or give 20 questions after they read it, but ultimately there is no substitute for trusting the user and their reading comprehension ... Of course I understand that you're not in a position to change these requirements.