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Hello!
I´m trying to create a epub-file with InDesign.
When I check it with the Epub validator PAGINA, I get an information code RSC-004
and message: File "OEBPS/font/Georgia.ttf" could not be decrypted.
How do I fix it?
When I open the epub file in Adobe Digital Edition it´s all a mess.
Best regards /
Janne from Sweden
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Explaining the project and content at length is always a good thing.
Derek and I differ in approach but yes, in general, you need to master EPUB as a format before you can successfully export anything but the simplest project. Even then, if you don't understand the "one text flow" rule, a short project will be just as poorly rendered on export.
The summary list I pointed to is a good beginning of what you need to understand, but it doesn't contain much specific information.
Tutorials can be quite variable. Many out there are either outdated, use unnecessarily complex or fussy methods or emphasize all the wrong things. The one Derek pointed out is fine, but it is skimming a lot of very complex steps and trying to get across several very complex steps with greatly simplified explanation. (Each one of those steps needs, as a start, a full tutorial on its own.)
I would focus on getting a simple project successfully built and exported to EPUB, using Thorium Reader (and perhaps Kindle Reader) as your final proof. When you've mastered the how, and styles as they pass through to EPUB, you can expand and re-structure and re-format your whole book.
It sounds like a very worthwhile project in itself, and (from all different perspectives) we'll be glad to help you complete it.
Use whatever resources are accessible and make sense to you, with two points in mind: anything more than about 2 years old (or undated) is probably wrong in some crucial way. And focus on help that begins with using InDesign; there is a large faction that uses other, far less reliable approaches and even considers ID unsuitable for EPUB, mostly from misunderstood technical reasons.
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Fixed format is fine as far as it goes, but it means pages can only be read on a relatively large screen, or by panning around the page image. It's suitable for image-based books, such as children's books, graphic novels, and certain kinds of informational books that have large, complex, image-based content.
For text only, though, reflowable should be the only format for new books. It is adaptable to more reader types, and to more user preference variations, and generates smaller, more manageable files.
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