diff --git a/credits/COPYRIGHTS.md b/credits/COPYRIGHTS.md
index 95779d04..2eb82628 100644
--- a/credits/COPYRIGHTS.md
+++ b/credits/COPYRIGHTS.md
@@ -16,6 +16,11 @@ notices in the individual files.
    * http://hackage.haskell.org/package/clock-0.7.2
    * See clock-0.7.2.txt for the original license.
 
+* Portions of UTF8 encoding/decoding code taken from the "base" package
+  * Copyright (c) The University of Glasgow, 2009
+  * http://hackage.haskell.org/package/base-4.12.0.0
+  * See base-4.12.0.0.txt for the original license.
+
 ## 0.4.0
 
 * Implementation of direct style monadic streams includes code from the
diff --git a/credits/base-4.12.0.0.txt b/credits/base-4.12.0.0.txt
new file mode 100644
index 00000000..e25dd46a
--- /dev/null
+++ b/credits/base-4.12.0.0.txt
@@ -0,0 +1,83 @@
+This library (libraries/base) is derived from code from several
+sources: 
+
+  * Code from the GHC project which is largely (c) The University of
+    Glasgow, and distributable under a BSD-style license (see below),
+
+  * Code from the Haskell 98 Report which is (c) Simon Peyton Jones
+    and freely redistributable (but see the full license for
+    restrictions).
+
+  * Code from the Haskell Foreign Function Interface specification,
+    which is (c) Manuel M. T. Chakravarty and freely redistributable
+    (but see the full license for restrictions).
+
+The full text of these licenses is reproduced below.  All of the
+licenses are BSD-style or compatible.
+
+-----------------------------------------------------------------------------
+
+The Glasgow Haskell Compiler License
+
+Copyright 2004, The University Court of the University of Glasgow. 
+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 name of the University 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 UNIVERSITY COURT OF THE UNIVERSITY OF
+GLASGOW AND THE 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
+UNIVERSITY COURT OF THE UNIVERSITY OF GLASGOW OR THE 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.
+
+-----------------------------------------------------------------------------
+
+Code derived from the document "Report on the Programming Language
+Haskell 98", is distributed under the following license:
+
+  Copyright (c) 2002 Simon Peyton Jones
+
+  The authors intend this Report to belong to the entire Haskell
+  community, and so we grant permission to copy and distribute it for
+  any purpose, provided that it is reproduced in its entirety,
+  including this Notice.  Modified versions of this Report may also be
+  copied and distributed for any purpose, provided that the modified
+  version is clearly presented as such, and that it does not claim to
+  be a definition of the Haskell 98 Language.
+
+-----------------------------------------------------------------------------
+
+Code derived from the document "The Haskell 98 Foreign Function
+Interface, An Addendum to the Haskell 98 Report" is distributed under
+the following license:
+
+  Copyright (c) 2002 Manuel M. T. Chakravarty
+
+  The authors intend this Report to belong to the entire Haskell
+  community, and so we grant permission to copy and distribute it for
+  any purpose, provided that it is reproduced in its entirety,
+  including this Notice.  Modified versions of this Report may also be
+  copied and distributed for any purpose, provided that the modified
+  version is clearly presented as such, and that it does not claim to
+  be a definition of the Haskell 98 Foreign Function Interface.
+
+-----------------------------------------------------------------------------
diff --git a/src/Streamly/Streams/StreamD.hs b/src/Streamly/Streams/StreamD.hs
index d3d66b8c..9a2efa5b 100644
--- a/src/Streamly/Streams/StreamD.hs
+++ b/src/Streamly/Streams/StreamD.hs
@@ -18,6 +18,7 @@
 -- Module      : Streamly.Streams.StreamD
 -- Copyright   : (c) 2018 Harendra Kumar
 -- Copyright   : (c) Roman Leshchinskiy 2008-2010
+-- Copyright   : (c) The University of Glasgow, 2009
 --
 -- License     : BSD3
 -- Maintainer  : harendra.kumar@gmail.com