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* ksquirrel-libs is under GNU LIBRARY GENERAL PUBLIC LICENSE (see LICENSE), except the following parts:

* JBIG library statically links against jbig-kit (which is under GPL, see LICENSE.GPL) by (C) Markus Kuhn
* MNG dynamically links against libmng, see LICENSE.MNG for more
* LJPEG library statically uses ljpg, see LICENSE.LJPEG for more
* DDS plugin is taken from KImageIO plugin from tdelibs 3.4.0 (which is under GPL)
* EPS plugin is taken from KImageIO plugin from tdelibs 3.4.0 (which is under LGPL)
* PSP plugin is taken from DevIL (which is under LGPL)
* TTF library dynamically links against libfreetype, and
  statically uses ftview from ftdemos-2.1.10, there are no LICENSE issues
  in ftdemos package, but it is still copyrighted
        Copyright 1996-2000, 2003, 2004, 2005 by
        (C) D. Turner, R.Wilhelm, and W. Lemberg
* XCF library statically uses xcf2pnm (which is under GPL)
* PNG library uses its own version of libpng to support APNG images, see LICENSE.PNG

other issues:
* DJVU library uses "ddjvu" executable (via fork) from http://djvu.sf.net
* DXF  library uses "vec2web" executable (via fork) from http://ribbonsoft.org
* TIFF library dynamically links against libtiff
* GIF  library dynamically links against libungif
* JPEG  library dynamically links against libjpeg
* PNG  library dynamically links against libpng
* WMF  library dynamically links against libwmf
* OPENEXR library dynamically links against OpenEXR libraries
* JPEG2000 library dynamically links against jasper, most code in this library
  was taken from jasper.c from jasper distribution, which is under JASPER LICENSE,
  see LICENSE.JASPER for more
* SVG library uses "rsvg-convert" executable (via fork)
* CAMERA library installs its own dcraw version 8.79. dcraw is by (C) Dave Coffin,
  which is free redistributable if no source code modification were applied:

/*
   dcraw.c -- Dave Coffin's raw photo decoder
   Copyright 1997-2007 by Dave Coffin, dcoffin a cybercom o net

   This is a command-line ANSI C program to convert raw photos from
   any digital camera on any computer running any operating system.

   No license is required to download and use dcraw.c.  However,
   to lawfully redistribute dcraw, you must either (a) offer, at
   no extra charge, full source code* for all executable files
   containing RESTRICTED functions, (b) distribute this code under
   the GPL Version 2 or later, (c) remove all RESTRICTED functions,
   re-implement them, or copy them from an earlier, unrestricted
   Revision of dcraw.c, or (d) purchase a license from the author.

   The functions that process Foveon images have been RESTRICTED
   since Revision 1.237.  All other code remains free for all uses.

   *If you have not modified dcraw.c in any way, a link to my
   homepage qualifies as "full source code".

   $Revision: 1.394 $
   $Date: 2007/11/04 02:18:54 $
 */

And here is dcraw home page: http://cybercom.net/~dcoffin/dcraw/