add licence from http://www.festvox.org/cmu_arctic/cmu_arctic_report.pdf

LICENSE

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+Carnegie Mellon University
+Copyright (c) 2003
+All Rights Reserved.
+
+Permission to use, copy, modify, and license this software and its
+documentation for any purpose, is hereby granted without fee,
+subject to the following conditions:
+1. The code must retain the above copyright notice, this list of
+conditions and the following disclaimer.
+2. Any modifications must be clearly marked as such.
+3. Original authors' names are not deleted.
+
+THE AUTHORS OF THIS WORK DISCLAIM ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.