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Apart from Amazon's DRMs, and other individual store DRM systems, the big player in the market (at the moment) is Adobe's DRM system. Kobo, and eBooks, and many other ebook stores use it.
You need to register for an Adobe ID (usually your email address) with Adobe, and then you use that with the book stores, and all your books have the same DRM key, and so can be used with any device or app that supports Adobe's DRM - again, essentially everything except Kindles.
Personally, I immediately strip Adobe's DRM from my purchased ebooks, and store them in calibre and read them with any ebook reading software I like. Just now I'm mostly using justRead.app because I have an iPhone. Other software is available.
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