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+Copyright © 2021 Plan 9 Foundation
+Portions Copyright © 2001-2008 Russ Cox
+Portions Copyright © 2008-2009 Google Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+===================================================================
+
+This software is derived from Plan 9, originally copyright Lucent Technologies
+and distributed under the Lucent Public License, Version 1.02.
+Lucent was bought by Alcatel, which was bought by Nokia.
+On March 23, 2021, Nokia announced the transfer of the Plan 9 copyrights to the
+Plan 9 Foundation, which in turn relicensed Plan 9 under the the MIT license,
+reproduced above.