I n t r o d u c t i o n

Here is what says Bernhard Herzog, the author of Sketch, concerning the licence under whom Sketch has been placed:

• Sketch itself is published under the terms of the GNU Library General Public License (LGPL). Some of the code distributed with Sketch is not directly part of Sketch and is distributed under a Python-style license.
• I've put it under the LGPL, because many parts of Sketch can be use as a library (and are used by Sketch that way), and the LGPL is less restrictive than the normal GNU General Public License when it come to distributing an LGPL'ed library with software covered by a different license.