Hi there. First post. Don't know if it's really in the right section but I hope it's okay here. Also, It's somewhat long, but you can skip to my question if you want
Even thought I've used my phone to read free books for a year or two using Aldiko I've been hesitant toward using services like Amazon's Kindle or Barnes & Noble's Nook ebook platforms because I don't want to feel like I'm locked down to a specific service, but then Google released Play Books in my country and it was exactly what I've waited for! Because now I can use one service to both read the free ebooks I've downloaded (or made for myself for that matter) as well buy books from a large library of ebooks.
My only problem is that, even though the vast majority of the books I'm interested in are available on Google Play, there is one series I desperately want to buy for my collection, but it's only available in Spanish, I think. The books in question are the Percy Jackson, Kane Chronicles and Heroes of Olympus series of books by Rick Riordan.
Now my question is, can I somehow buy the books from Amazon, Barnes & Noble, or maybe some other platform and then upload them to my Google Play library?
I know Kindle would require conversion and apparently Nook has some kind of copy protection, but I wondered if it was possible somehow, and if it is, what method would be the easiest.
(I already have a Kindle account, since I tried to use them before, but their document upload feature was a serious disappointment.)
Thanks for taking the time reading and Thanks for any kind of answer.