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The secure pdf books often have tiny print (think: same text of a regular book page presented on the smaller Reader screen with huge margins!). Increasing font size geneerally messes up formatting completely (half-lines with original line breaks, words broken across lines, figures disappearing, etc.). For instance, I'm reading a physics book in this format, and it requires reading glasses because the extremely tiny print is the only text size that doesn't totally mess up the content.
OTOH, Msoft (.lit) books are formatted nicely when converted to .lrf.
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