I am looking to buy a new ereader, but before that i thought i'd ask everyone what format support i should be looking for. I don't want any formats like Mobi that are owned by a single company (Amazon) which could potentially be gone in the future (as unlikely as that is in Amazon's case). Also, i'd prefer one that devices i buy in the future might support. If i buy all my books from Amazon and decide 2 years down the line i want a nook or something i will be screwed. I know you can convert books to different formats using Calibre, but i've had some books get messed up after a format change, so i'd rather not.
I only know about Mobi so far. How is ePub? Is it owned by anyone in particular? What formats should i keep an eye out for? When i buy my ereader i will be looking for one without much of an ecosystem or an open one, because i will be using DRM free books, whether i buy them that way or i make them that way myself. So which formats are usually sold by DRM free stores?
Sorry if this is a weird question, or if it's in the wrong place. I couldn't see a better place to ask it. And as always, any help is greatly appreciated