> then we have missed the mark I don't agree. I have offered an open text, including free supplemental materials, for 15 years (so I think I have some credibi

> then we have missed the mark I don't agree. I have offered an open text, including free supplemental materials, for 15 years (so I think I have some credibility). But other people want to do other things. Free is Free for the authors as well as for the readers. If someone wants to have a go at giving away a text and selling the slides for classroom use then I wish them luck. If students and teachers find that useful then good.