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There are other forms of DRM including Apple's FairPlay. iBooks are formatted using the same HTML as the others but their DRM is unique to Apple eBooks making them unreadable on any other brand. Older forms of DRM were once used by Microsoft before they stopped selling eBooks. The Microsoft LIT formated books are no longer readable.
There was once an earlier form of Amazon's Mobipocket. When Amazon stopped selling eBooks they gave people three months to download all their books before the Amazon servers no longer supported Amazon's DRM. When they introduced the Kindles and resumed selling eBooks they continued using the Mobi formatting but began using a new version of DRM that is incompatible with the old version, thus our older Mobi eBooks could no longer be read without removing the DRM.
DRM is the cause of many problems such as when a new reader buys a book from Amazon and they have an eReader that renders ePub. It's a simple matter to change the formatting except the DRM prevents you from doing it.
Kobo eReaders come with an advanced rendering engine that supports many advanced features of ePub3 and they also include the older Adobe rendering engine for ePub2 books on every Kobo eReader. You can read ePub2 books with Kobo's advanced engine as long as it does not have DRM. In other words, the DRM is the only thing preventing an improvement.
I apologize for the rant. I didn't mean to let it all out like this. You might notice that most people are not fans of DRM even though we've paid for dozens, hundreds or thousands of copies of it on nearly every book we buy.
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