ORIGINAL LICENSE:
The $1 Unistroke Recognizer (C# version)

 Jacob O. Wobbrock, Ph.D.
 The Information School
 University of Washington
 Mary Gates Hall, Box 352840
 Seattle, WA 98195-2840
 wobbrock@uw.edu

 Andrew D. Wilson, Ph.D.
 Microsoft Research
 One Microsoft Way
 Redmond, WA 98052
 awilson@microsoft.com

 Yang Li, Ph.D.
 Department of Computer Science and Engineering
 University of Washington
 The Allen Center, Box 352350
 Seattle, WA 98195-2840
 yangli@cs.washington.edu

The Protractor enhancement was published by Yang Li and programmed here by
Jacob O. Wobbrock.

 Li, Y. (2010). Protractor: A fast and accurate gesture
   recognizer. Proceedings of the ACM Conference on Human
   Factors in Computing Systems (CHI '10). Atlanta, Georgia
   (April 10-15, 2010). New York: ACM Press, pp. 2169-2172.

This software is distributed under the "New BSD License" agreement:

Copyright (c) 2007-2011, Jacob O. Wobbrock, Andrew D. Wilson and Yang Li.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 * Neither the names of the University of Washington nor Microsoft,
   nor the names of its contributors may be used to endorse or promote
   products derived from this software without specific prior written
   permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Jacob O. Wobbrock OR
Andrew D. Wilson OR Yang Li BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.