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@@ -8,12 +8,12 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 This code is released under the libpng license.
-libpng versions 1.0.7, July 1, 2000, through 1.6.20, December 3, 2015, are
-Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson, are
+libpng versions 1.0.7, July 1, 2000 through 1.6.23, June 9, 2016 are
+Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
 added to the list of Contributing Authors:
    Simon-Pierre Cadieux

@@ -30,10 +30,14 @@
    efforts or the library will fulfill any of your particular purposes
    or needs.  This library is provided with all faults, and the entire
    risk of satisfactory quality, performance, accuracy, and effort is with
    the user.
+Some files in the "contrib" directory and some configure-generated
+files that are distributed with libpng have other copyright owners and
+are released under other open source licenses.
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
 libpng-0.96, and are distributed according to the same disclaimer and
 license as libpng-0.96, with the following individuals added to the list
 of Contributing Authors:

@@ -53,10 +57,13 @@
    Sam Bushell
    Magnus Holmgren
    Greg Roelofs
    Tom Tanner
+Some files in the "scripts" directory have other copyright owners
+but are released under this license.
 libpng versions 0.5, May 1995, through 0.88, January 1996, are
 Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:

@@ -93,20 +100,31 @@
 source code in a product, acknowledgment is not required but would be
-A "png_get_copyright" function is available, for convenient use in "about"
-boxes and the like:
-   printf("%s", png_get_copyright(NULL));
+The name "libpng" has not been registered by the Copyright owner
+as a trademark in any jurisdiction.  However, because libpng has
+been distributed and maintained world-wide, continually since 1995,
+the Copyright owner claims "common-law trademark protection" in any
+jurisdiction where common-law trademark is recognized.
-Also, the PNG logo (in PNG format, of course) is supplied in the
-files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
 Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is
 a certification mark of the Open Source Initiative. OSI has not addressed
 the additional disclaimers inserted at version 1.0.7.
+The Copyright owner believes that the Export Control Classification
+Number (ECCN) for libpng is EAR99, which means not subject to export
+controls or International Traffic in Arms Regulations (ITAR) because
+it is open source, publicly available software, that does not contain
+any encryption software.  See the EAR, paragraphs 734.3(b)(3) and
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-December 3, 2015
+June 9, 2016
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