SEPL (Swiss Ephemeris Public License)

[Joshua Tacoma <joshua@josh.is-a-geek.org>]

(not only am INAL, I also have no experience developing debian packages, 
and this may grow into my first one)

I am looking at packaging the Swiss Ephemeris:
   http://www.astro.com/swisseph/?lang=e
It's available under two licenses: one (free) for "Open Source" use, the 
other ($) for "commercial" use.  Here is the free license
   http://www.astro.com/swisseph/sepl.htm

My confusion: there is an opening note (before the license text itself)

:   If you do not meet the requirements in the SEPL, for example if
:   - you develop and distribute software which is sold for a fee higher 
than a reasonable copy charge

However, I haven't found grounds for this note in the license's terms.  
The closest I can find is in 6.a., in reference to software that links 
to the Swiss Ephemeris:

:   You must ensure that all recipients of machine-executable forms of 
these items are also able to receive and use the complete 
machine-readable source code to the items without any charge beyond the 
costs of data transfer.

...which does not seem to disallow setting high prices on the 
machine-executable forms.

So: is this 'main' material or not?

Thanks.