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@Freeshadow --- maybe because for many years there was no way to extract a font out of a pdf. Also, there is no guarantee that the book creator will actually subset the font (they might not care about file size) --- there is nothing to prevent embedding the complete font, and then the full font is available to the public.
Incidentally, I have actually seen on some of the less-reputable "free font" sites, uploads of partial fonts --- so we know the uploader extracted a subsetted font from somewhere, and illegally offered it for distribution.
I don't know why they would bother --- so many fonts are pirated and offered for free download --- you can get full sets of Adobe fonts with 9 faces from many different free font sites.
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