The ebuild says GPL-2, but there is no reference to this in the tarballs. The tz-link page says: The public-domain time zone database contains code and data that ... Also the source files have the following comment: /* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson. */
Yea, most of the files are "public-domain". There are 3 or 4 that have a BSD license on them (in tzcode). So, public-domain or BSD...but certainly not GPL :)
http://sources.gentoo.org/sys-libs/timezone-data/timezone-data-2008i.ebuild?r1=1.1&r2=1.2