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Digital Editions supports the PDF/A specification, with the exception of supporting ACS encrypted content. PDF/A disallows among other things, JavaScript and Form Fields both of which is necessary to make your navigation buttons work. From the FAQ:
The intention is to support in Digital Editions those PDF features reasonably needed by eBooks and other commercially published content, balancing 100% coverage with a focus on small size and high performance
Since adding in a Javascript engine and Form field support would greatly add to the size of Digital Editions, I wouldn't expect this to change just to support in document navigation UI.
Jim Lester
Adobe Systems
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