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Originally Posted by Sam Sahara
No, it's simpler. If I buy a font set I have the right to use it but not the right to share it. Obfuscating fonts is a way to use font sets without let other people to extract my fonts, respecting my contract with the foundry. It is well explained in the link provided by PenguinCEO.
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Depends on the font foundry. Some allow use in ebooks if obfuscated, others require you to purchase an additional license which allows redistribution of the obfuscated font since they realize a DRM scheme where the key must be present in clear text in the epub file is pretty much useless.
Sigil has an option in it's right click font menu to use no obfuscation, Adobe or IDPF obfuscation which has been there for a decade.
Oddly, I've seen more publishing houses using Adobe's font obfuscation rather than the IDPF (or whatever the correct name currently is) font obfuscation.
As for any protection offered by obfuscation? I seem to recall that calibre can can and will remove font obfuscation. As the link mentions:
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The proposed mechanism will simply provide a stumbling block for those who are unaware of the license details of the supplied font. It will not prevent a determined user from gaining full access to the font.
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In any case, subsetting is definitely the better option than font obfuscation IMSHO. Something which calibre's editor fully supports.
Quote:
Originally Posted by Sam Sahara
It is professional because it is the system used by publishing houses.
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Thanks for the laugh. I've looked at quite a few epubs produced by publishing houses. Professional is not the word that comes to mind for many of them.