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This license was found on the "midnight" component in TeXLive. It is barely free, and GPL-incompatible. It is not recommended that this license be used in any context other than on the "midnight" component in TeXLive.
% copyright (c) 1991 Marcel R. van der Goot % You can use these macros to typeset documents. You may % distribute this file freely, provided that you also distribute % the accompanying documentation. % You may make changes to this file, or extract portions % of it for inclusion in other files, provided that % (1) you change the name of the file; % (2) you give proper credit and include copyright % information where applicable; % (3) explain how an unchanged version can be obtained; and % (4) document the usage of your macros/changes (if usage % of your macros is not worth documenting, they must not % be worth using). % You are not allowed to use the name ``Midnight Macros'' for % any changed files. % The above rules for making changes do not apply where it % is explicitly noted in this file that something can be changed % to conform to your local installation.