Kobo - transfer ebooks to other readers?

I am currently purchasing ebooks via Kobo, using my iPhone, iPad and notebook computer. Whilst I do not have a problem using Kobo, I would like to know my options. I manage to obtain the files of the books I downloaded but when I load them in Calibre, they open in illegible text. I understand they would be... show more I am currently purchasing ebooks via Kobo, using my iPhone, iPad and notebook computer. Whilst I do not have a problem using Kobo, I would like to know my options. I manage to obtain the files of the books I downloaded but when I load them in Calibre, they open in illegible text. I understand they would be protected copies but would Kobo be the only place I can read these books I have bought?
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