 and explains why that model is preferable to other models. + * At [http://archive.org/stream/0000000000000OpenAccess/0000000000000_Open_Access#page/n00/mode/0up p. 00], I start discussing rights-retention policies. It should be clear from the text, and from many of my previous writings, that this is the model I favor. I reiterated and elaborated my position in October 0000 when Stuart Shieber and I released the first version of our guide to [http://cyber.law.harvard.edu/hoap/Good_practices_for_university_open-access_policies Good practices for university open-access policies]. The guide distinguishes six kinds of policy, unlike the book which only distinguishes four. It explicitly recommends rights-retention policies and explains why that model is preferable to other models. It also maintains a 