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Not really specifically for DRM. The format was create to allow companies with only paper copies to quickly build ebooks (with as little effort at Amazon's end as possible, I'm sure), without taking the time to re-input them to digital form.
It's basically similar to a PDF with the images included (and ocr'd text in it, usually, which is used for the indexes and searching). The "fonts" are then created from the OCR'd images and the "letters" it created. The problem being that often things get jumbled in the presentation (as they don't actually show you the images, but font-adjustable text; sometimes, though, it forgets where a paragraph starts and puts the part of the first sentence or so at the end of the paragraph, which can make reading a bit more "interesting"). Fonts are usually awful, as a result, and embedded tables can be unreadable (then again, that can happen on all the formats).
Some Topaz books, though, can look quite good. I suspect they were cleaner copies and scanned at higher resolutions.
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