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Just to add to the thread, here's a sample electronic publication license from Linotype:
Licences for electronic publications (ePubs)
An electronic publication licence authorises you to embed the font in electronic documents, such as e-books, e-magazines and e-newspapers. Each licence is valid for one title only and for the full operating life of that title. If the font is not to be directly embedded in an electronic publication (if, for example, it is be used to generate a static image, such as the cover of an e-book), you will instead need to purchase a desktop font licence.
Every issue of an e-magazine, e-newspaper or other form of e-periodical is considered a separate, new publication. Format variations do not count as separate publications. You will not need to purchase new licences for updated versions of publications that are issued free to already existing readers. However, newly issued versions are defined as separate, new publications.
You’ll find answers to about common questions regarding extended licenses like licenses for electronic publications (ePubs) in our informative in our Web fonts FAQ section.
I checked with several other font foundries and their agreements were much the same -- every ebook title requires it's own license though some do offer multiple licenses on the same purchase so you can purchase 5 license packs at a bit of a discount.
Also commonly found:
The digital publication may not allow the installation of the font on the operating system where the publication is viewed, nor may it allow end user access to the font software independently of the digital publication software.
A query to one foundry was responded to with subsetting being the preferred method for any electronic publication. Obfuscation is allowed where the entire font must be embedded but is not recommended since it is basically considered to offer no protection for their IP.
Also surprising was the number of foundries (Berthold as a example) that specifically prohibit the use of their fonts in electronic publications:
No Digital Publishing. Licensee may not use the Font Software to create, and/or embed the Font Software (or vector and rasterized representations of the Font Software) into, any form of digital publishing document files (e.g. e-books) including EPUB/PDF/TIFF/JPG/PNG/SVG and similar formats including vector and rasterized representations of the Font Software.
Admittedly, reading through Berthold's EULA made me wonder just what you could use their font's for. Pretty much every use seems to be prohibited. They do offer an enterprise license -- just make sure you are in a comfortable chair when you start down that path. Cheap, they ain't.
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