DB

I think DB is the best DBM implementation, and it deserves to be in
the SDK because the applications of DBM files are much fewer without
it.

A reading of the basic Sleepycat license seems to mean it's ok to
distribute it with the SDK both in binary and source forms.
http://www.sleepycat.com/licensing.html

I can't think of a reason not to include it.

Nat