I've just spoken to Sonja about this. Please see below for the end of
an email she sent me this morning regarding the copyright status of
the language.
Angela.
---------- Forwarded message ----------
From: Sonja Elen Kisa <marraskuu1978(a)yahoo.com>
Date: Wed, 22 Sep 2004 00:45:44 -0400 (EDT)
Subject: toki pona Wikipedia
To: angela(a)wikimedia.org
[...]
Anyway, the Toki Pona language is obviously released
under the GFDL.
Sincerely,
Sonja