How does use of bsddb interact with Python in a commercial environment?

[Kenneth McDonald]

This is something I've been curious about for a while, and have never
quite figured out...

What are the legalities of writing commercial code which makes use
of the bsddb module in Python? I would expect that payment of some
sort would be necessary, but have no idea how much/under what terms.
Sleepycat's most basic fee is $25,000 I believe, if people wish to
incorporate code into their product, but what about the case (as
in Python) where the code is being accessed only indirectly?

No wonder I'm an engineer and not a lawyer :-)

Thanks,
Ken McDonald