diff --git a/Doc/license.rst b/Doc/license.rst
index ddc69b839d7..91c0d7bad90 100644
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -934,3 +934,36 @@ on the cfuhash project::
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    OF THE POSSIBILITY OF SUCH DAMAGE.
 
+ 
+libmpdec
+--------
+
+The :mod:`_decimal` Module is built using an included copy of the libmpdec
+library unless the build is configured ``--with-system-libmpdec``::
+
+   Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+   2. 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.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS 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.
+
+
diff --git a/Modules/_decimal/libmpdec/basearith.c b/Modules/_decimal/libmpdec/basearith.c
index dd21a7a885f..35de6b82849 100644
--- a/Modules/_decimal/libmpdec/basearith.c
+++ b/Modules/_decimal/libmpdec/basearith.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/basearith.h b/Modules/_decimal/libmpdec/basearith.h
index 114cef38603..976358a110e 100644
--- a/Modules/_decimal/libmpdec/basearith.h
+++ b/Modules/_decimal/libmpdec/basearith.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/bits.h b/Modules/_decimal/libmpdec/bits.h
index 949ec944ca5..b5eaa24976a 100644
--- a/Modules/_decimal/libmpdec/bits.h
+++ b/Modules/_decimal/libmpdec/bits.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/constants.c b/Modules/_decimal/libmpdec/constants.c
index 92f5891b56f..2c2d5ea4810 100644
--- a/Modules/_decimal/libmpdec/constants.c
+++ b/Modules/_decimal/libmpdec/constants.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/constants.h b/Modules/_decimal/libmpdec/constants.h
index 13df9202123..c0febfc8772 100644
--- a/Modules/_decimal/libmpdec/constants.h
+++ b/Modules/_decimal/libmpdec/constants.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/context.c b/Modules/_decimal/libmpdec/context.c
index 159f88c339e..24c7b890c1d 100644
--- a/Modules/_decimal/libmpdec/context.c
+++ b/Modules/_decimal/libmpdec/context.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/convolute.c b/Modules/_decimal/libmpdec/convolute.c
index b5fe131b07c..4c62e8bd3ab 100644
--- a/Modules/_decimal/libmpdec/convolute.c
+++ b/Modules/_decimal/libmpdec/convolute.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/convolute.h b/Modules/_decimal/libmpdec/convolute.h
index c35ed461d3b..f30a177a684 100644
--- a/Modules/_decimal/libmpdec/convolute.h
+++ b/Modules/_decimal/libmpdec/convolute.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/crt.c b/Modules/_decimal/libmpdec/crt.c
index c71c4ee8f80..4a1e80a2322 100644
--- a/Modules/_decimal/libmpdec/crt.c
+++ b/Modules/_decimal/libmpdec/crt.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/crt.h b/Modules/_decimal/libmpdec/crt.h
index 8909232231a..f61e7729363 100644
--- a/Modules/_decimal/libmpdec/crt.h
+++ b/Modules/_decimal/libmpdec/crt.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/difradix2.c b/Modules/_decimal/libmpdec/difradix2.c
index 4ebb0b54b0a..06e5ab5e222 100644
--- a/Modules/_decimal/libmpdec/difradix2.c
+++ b/Modules/_decimal/libmpdec/difradix2.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/difradix2.h b/Modules/_decimal/libmpdec/difradix2.h
index 81aa598543f..5e22bcf324f 100644
--- a/Modules/_decimal/libmpdec/difradix2.h
+++ b/Modules/_decimal/libmpdec/difradix2.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/fnt.c b/Modules/_decimal/libmpdec/fnt.c
index 93116539b9f..7e924c85242 100644
--- a/Modules/_decimal/libmpdec/fnt.c
+++ b/Modules/_decimal/libmpdec/fnt.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/fnt.h b/Modules/_decimal/libmpdec/fnt.h
index 1f302cccbfa..fa2154a798d 100644
--- a/Modules/_decimal/libmpdec/fnt.h
+++ b/Modules/_decimal/libmpdec/fnt.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/fourstep.c b/Modules/_decimal/libmpdec/fourstep.c
index aa32c0d5cf2..21d3e7485df 100644
--- a/Modules/_decimal/libmpdec/fourstep.c
+++ b/Modules/_decimal/libmpdec/fourstep.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/fourstep.h b/Modules/_decimal/libmpdec/fourstep.h
index 593f27d489f..80dcd4be3d5 100644
--- a/Modules/_decimal/libmpdec/fourstep.h
+++ b/Modules/_decimal/libmpdec/fourstep.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/io.c b/Modules/_decimal/libmpdec/io.c
index 36470ca0062..b67324da941 100644
--- a/Modules/_decimal/libmpdec/io.c
+++ b/Modules/_decimal/libmpdec/io.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/io.h b/Modules/_decimal/libmpdec/io.h
index 3dfce732aa4..de5486a00ca 100644
--- a/Modules/_decimal/libmpdec/io.h
+++ b/Modules/_decimal/libmpdec/io.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/literature/fnt.py b/Modules/_decimal/libmpdec/literature/fnt.py
index bf937459f52..6363536da64 100644
--- a/Modules/_decimal/libmpdec/literature/fnt.py
+++ b/Modules/_decimal/libmpdec/literature/fnt.py
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+# Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/literature/mulmod-64.txt b/Modules/_decimal/libmpdec/literature/mulmod-64.txt
index 93bf22e9fed..029b8de3d7c 100644
--- a/Modules/_decimal/libmpdec/literature/mulmod-64.txt
+++ b/Modules/_decimal/libmpdec/literature/mulmod-64.txt
@@ -59,7 +59,7 @@ The reduction step b) preserves congruence:
 Maximum numbers of step b):
 ---------------------------
 
-# To avoid unneccessary formalism, define:
+# To avoid unnecessary formalism, define:
 
 def R(hi, lo, z):
      return divmod(hi * z - hi + lo, 2**64)
diff --git a/Modules/_decimal/libmpdec/literature/umodarith.lisp b/Modules/_decimal/libmpdec/literature/umodarith.lisp
index 008e9f4507f..99d71c373d1 100644
--- a/Modules/_decimal/libmpdec/literature/umodarith.lisp
+++ b/Modules/_decimal/libmpdec/literature/umodarith.lisp
@@ -1,5 +1,5 @@
 ;
-; Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+; Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
 ;
 ; Redistribution and use in source and binary forms, with or without
 ; modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/memory.c b/Modules/_decimal/libmpdec/memory.c
index bf6350f9049..0f41fe50645 100644
--- a/Modules/_decimal/libmpdec/memory.c
+++ b/Modules/_decimal/libmpdec/memory.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/memory.h b/Modules/_decimal/libmpdec/memory.h
index 7e73c130593..9c98d1a4000 100644
--- a/Modules/_decimal/libmpdec/memory.h
+++ b/Modules/_decimal/libmpdec/memory.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/mpdecimal.c b/Modules/_decimal/libmpdec/mpdecimal.c
index 5c8797ab520..d096e96bc2f 100644
--- a/Modules/_decimal/libmpdec/mpdecimal.c
+++ b/Modules/_decimal/libmpdec/mpdecimal.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/mpdecimal.h b/Modules/_decimal/libmpdec/mpdecimal.h
index 676c72dbdb1..203275bcd11 100644
--- a/Modules/_decimal/libmpdec/mpdecimal.h
+++ b/Modules/_decimal/libmpdec/mpdecimal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/numbertheory.c b/Modules/_decimal/libmpdec/numbertheory.c
index 10ce6dc1464..4e035477e28 100644
--- a/Modules/_decimal/libmpdec/numbertheory.c
+++ b/Modules/_decimal/libmpdec/numbertheory.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/numbertheory.h b/Modules/_decimal/libmpdec/numbertheory.h
index 10922546198..e94c157910c 100644
--- a/Modules/_decimal/libmpdec/numbertheory.h
+++ b/Modules/_decimal/libmpdec/numbertheory.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/sixstep.c b/Modules/_decimal/libmpdec/sixstep.c
index 7d0542d641d..92d513ebe18 100644
--- a/Modules/_decimal/libmpdec/sixstep.c
+++ b/Modules/_decimal/libmpdec/sixstep.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/sixstep.h b/Modules/_decimal/libmpdec/sixstep.h
index 0467007061b..4a8b015e3a9 100644
--- a/Modules/_decimal/libmpdec/sixstep.h
+++ b/Modules/_decimal/libmpdec/sixstep.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/transpose.c b/Modules/_decimal/libmpdec/transpose.c
index 5e5d4b6625e..55d6d899227 100644
--- a/Modules/_decimal/libmpdec/transpose.c
+++ b/Modules/_decimal/libmpdec/transpose.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -169,7 +169,7 @@ squaretrans(mpd_uint_t *buf, mpd_size_t cols)
 /*
  * Transpose 2^n * 2^n matrix. For cache efficiency, the matrix is split into
  * square blocks with side length 'SIDE'. First, the blocks are transposed,
- * then a square tranposition is done on each individual block.
+ * then a square transposition is done on each individual block.
  */
 static void
 squaretrans_pow2(mpd_uint_t *matrix, mpd_size_t size)
diff --git a/Modules/_decimal/libmpdec/transpose.h b/Modules/_decimal/libmpdec/transpose.h
index 7e349ee08df..e1cd1fa17dd 100644
--- a/Modules/_decimal/libmpdec/transpose.h
+++ b/Modules/_decimal/libmpdec/transpose.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/typearith.h b/Modules/_decimal/libmpdec/typearith.h
index 614812c69e2..405237dac51 100644
--- a/Modules/_decimal/libmpdec/typearith.h
+++ b/Modules/_decimal/libmpdec/typearith.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/umodarith.h b/Modules/_decimal/libmpdec/umodarith.h
index 436761bc448..68d15188cb3 100644
--- a/Modules/_decimal/libmpdec/umodarith.h
+++ b/Modules/_decimal/libmpdec/umodarith.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/vccompat.h b/Modules/_decimal/libmpdec/vccompat.h
index 276e0372cb6..f58e023c628 100644
--- a/Modules/_decimal/libmpdec/vccompat.h
+++ b/Modules/_decimal/libmpdec/vccompat.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+ * Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/Modules/_decimal/libmpdec/vcdiv64.asm b/Modules/_decimal/libmpdec/vcdiv64.asm
index 31bba08b0cb..6b6645673ab 100644
--- a/Modules/_decimal/libmpdec/vcdiv64.asm
+++ b/Modules/_decimal/libmpdec/vcdiv64.asm
@@ -1,5 +1,5 @@
 ;
-; Copyright (c) 2008-2012 Stefan Krah. All rights reserved.
+; Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
 ;
 ; Redistribution and use in source and binary forms, with or without
 ; modification, are permitted provided that the following conditions