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Just a quick comment to update the thread on progress.
I've been in contact with Bill Davis of fontmarketplace.com, who was kind enough to check the output from his copy of Indesign CS4, which it turns out does encrypt the fonts it embeds, although not using the IDPF encryption.
I haven't found any tools that I can easily use to just encrypt the fonts in an ePub, so I'm writing my own python script to do it. Goodness - python's fun! I'm currently to the stage where I have my encryption key and a list of fonts in the ePub, and now 'all' I have to do is write out the ePub with the amended fonts and an added encryption.xml file...
I hope to hear from Mr Davis 'soon' as to whether their licence is intended to cover fonts embedded in ePubs with encryption, but he may be waiting to see some samples with actual IDPF encryption.
And now I'm off back to the splendid IDLE python development environment.
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