content: Hello there! I'm Marvin, the founder here. Thanks for trying us out and helping us with your positive feedback on the concept.  I see this being pushed with a licensing model where you need to rent your books.  Not at all. In fact we're all for the opposite. Bubblin by itself doesn't place any licensing restrictions on the books it hosts on behalf of the authors. It is the author's choosing to make; my own books are, for example, available on Github, licensed under MIT, for anyone to refer or reuse the code for their own projects. Bubblin doesn't utilize any proprietary software or closed format or encapsulation for that matter. It's just plain good HTML, CSS & JS written over a substrate of iframes (again HTML) that provides a book-like experience on your browser. This means that our books are readable anywhere. It is as good as watching a video or reading a blog on the web. You DO NOT need a licensed reader for it. In fact it is pointless to even have one! Coming to topic of renting or owning an artifact: Yes, we can have a model of renting superbooks, and probably pass along a lower cost to the readers, but as of now we sell copies of the book and let the authors choose a sales model for themselves. We hope to adapt more options like renting, independent publishing as we dig deeper and understand the market better. But I don't think restrictive licensing or needing special readers would ever be a concern on the web.