This license was found in texlive 2010, in the abstyles component, hence its name. It is Free, but GPL incompatible.
% This is APREAMBL.TEX, version 1.10e, written by Hans-Hermann Bode % (HHBODE@DOSUNI1.BITNET), for the BibTeX `adaptable' family, version 1.10. % See the file APREAMBL.DOC for a detailed documentation. % This program is distributed WITHOUT ANY WARRANTY, express or implied. % Copyright (C) 1991, 1992 Hans-Hermann Bode % Permission is granted to make and distribute verbatim copies of this % document provided that the copyright notice and this permission notice % are preserved on all copies. % Permission is granted to copy and distribute modified versions of this % document under the conditions for verbatim copying, provided that the % entire resulting derived work is distributed under the terms of a % permission notice identical to this one.