From webpage linked above under home menu PDF Instead of ePub item.
Quote:
PDF instead of ePub
We have decided against ePub for several reasons:
ePub can't do complex layouts
ePub is not quotable
needs additional effort to produce
is not really cross-platform
embedding of audio & video is inefficient
no interactive content
DRM is not safe and doesn't work properly
A PDF file is easier to handle and already present in most cases. Time consuming conversions are not necessary.
Our mediaTresor container contains all data in one single file. To add interactive content we have developed our mediaTresor-Script, which is controlled by simple links.
Example-Links:
audio://001 (plays single MP3-File)
video://001 (plays a MP4-Video)
audio://001-30-60 (plays the MP3 starting from second 30 to 60)
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To me it reads like a list of the advantages of epub, at least when it comes to reading traditional book content. I don't know that Tresor encryption, which it presumably uses, can be cracked. Sounds like a format to steer well clear of.