I am wondering if 'registering' has any ill effects, like not being able to download from other sources than 'entourage' such as google books / android apps or a local university e-library? Thoughts? (I haven't taken a step past #5 I think it is ... can someone help to ease the seeming need for indecision herein?). I haven't ventured too far in exploring the entourage universe yet, as is likely obvious. Input welcome! Thanks, Mark.