I use my iphone as an ereader and it uses epub files. I do use calibre to convert the book if its not an epub and it works fine for that. I have never tried to remove drm from an ebook cause I have no need to I get most of my books from demonoid so no drm but im sure it cant be that hard to do. oh and calibre is really good at setting up the proper format for the file type, love that program. enjoy your new ereader 
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