Digital Editions is needed to read Adobe DRM-ed EPUB books on Mac or PC desktops, but it apparently DE doesn't ship with a font that has the 'glyphs' for certain UTF-8 characters, e.g. ŷ and ŵ. (y and w with circumflex).
This means that publishers of Welsh-language eBooks have been shipping their books with embedded fonts that do contain these missing characters. Or else, these characters would be substituted by '?' But, this swells up the filesize from 100k up to 500k. Does this sound right? Do you know of a workaround?
Is there someone at Adobe who can get the missing glyphs uploaded to solve this problem once and for all?