Chris Browne <cbbrowne@acm.org> writes:
> The FSF characterizes the PostgreSQL license as being "an X11 style
> license." They felt a need to distinguish between different
> variations of licenses that are called 'BSD licenses.'
>
> The FSF web site then compares various variations on "BSD licenses,"
> considering that there are some that they deem to be "free" (in their
> terms), and that there are others that they deem to _NOT_ be "free"
> (again in their terms).
No, that's not what the FSF says. All the BSD licenses are considered
free by the FSF. (Look at the web page yourself.) Most BSD licenses
are compatible with the GPL, but the original BSD license contains a
problematic advertising clause that makes it incompatible with the
GPL.
The Postgres license is a free software license that is GPL
compatible.