Cuis is distributed subject to the MIT License, as in http://www.opensource.org/licenses/mit-license.php . Any contribution submitted for incorporation into or for distribution with Cuis shall be presumed subject to the same license.

Portions of Cuis are:
Copyright (c) Xerox Corp. 1981, 1982
Copyright (c) Apple Computer, Inc. 1985-1996
Copyright (c) Contributors to Squeak and Cuis projects. 1997-2010