[thiago.eec]

Originally Posted by Azdaema

My reader is the iBooks app on my iphone. Are you saying that even a completely properly embedded font will still not show up on some readers?

For iOS, you need an extra step when producing your epub file.

For epub2:

You need to add this file to the META-INF directory:

com.apple.ibooks.display-options.xml

The contents of the file:

Spoiler:

<?xml version='1.0' encoding='utf-8'?>
<display_options>
<platform name="*">
<option name="specified-fonts">true</option>
</platform>
</display_options>

For epub3:
On the opf file, add the ibooks prefix to the <package> element:

<package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="isbn-id" prefix="ibooks: http://vocabulary.itunes.apple.com/rdf/ibooks/vocabulary-extensions-1.0/ a11y: http://www.idpf.org/epub/vocab/package/a11y/#" xml:lang="pt-BR">

Then, add a <meta> element inside the <metadata> element, like this:

<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
    ...
    <meta name="cover" content="cover.jpg"/>
    <meta property="ibooks:specified-fonts">true</meta>
    ...
</metadata>

Of course, this sucks. Embedded fonts should work properly on iOS without this platform-specific property/file added.