It's similar to GPL's "copyleft". I think it's no different from what we do with e.g. GNU readline, so I think it's okay. Redistributors of Python in binary form will have to beware though. I wonder if we're on thin ice with the RPMs (since we don't clarify any of this)?
... but we're not including readline in the standard Python distribution. Why would we want to include the database code itself in Python ?
Not in the source distro, but it will end up in the RPMs and other binary distros.
--Guido van Rossum (home page: http://www.python.org/~guido/)