When the license manager app starts, click the "Purchase" button. It
will take you to a page where you can "Purchase" Authentic for free (you
have to enter an email address). They'll email you a key.
I'm poking around in it now with a small doc. From what I can tell the
".sps" file for docbook (a set of instructions that tells Authentic how
to present an instance of docbook) isn't written all that well, but
you'll get the idea--it's a way to create forms/templates for
non-xml-aware content providers. Does anybody have/know of a better
DocBook.sps than the one provided?