Scotty,
Not sure if you noticed the tool lrf2lrs on the librie yahoo group - you can use it to extract lrf's back to lrs source files. Sony didn't encrypt the sample books they provided on the reader - they are just plain lrfs. Using the lrf2lrs tool you can extract most of them (some don't work) and take a look at their construction. It may help with understanding some of the lrf format.
I think the ones that don't work have tags that the librie doesn't use.
Based on the headers it looks like Sony is creating their content using BookCreator.
Rob
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