一、Portable Document Format (PDF)
* Copyright 1985-2004 Adobe Systems Inc.二、FreeType2
* Copyright 1996-2001, 2006David Turner, Robert Wilhelm, and Werner Lemberg三、LibJPEG
* Copyright (C) 1991-1998 Independent JPEG Group四、Little cms
* Copyright (C) 1998-2010 Marti Maria五、ZLib
* Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler六、Anti-Grain Geometry - Version 2.4
* Copyright (C) 2002-2004 Maxim Shemanarev (http://www.antigrain.com)七、Jbig2enc
* Copyright (C) 2006 Google Inclicensed under the Apache license八、Leptonlib
* Copyright (C) 2001 Leptonica九、Libpng
* Copyright (c) 1998-2009 Glenn Randers-Pehrson* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)十、Libtiff
* Copyright (c) 1991-1997 Sam Leffler* Copyright (c) 1991-1997 Silicon Graphics, Inc十一、Solid Framework
* Copyright (C) 2000-2020 Solid Documents Limited十二、libjpeg-turbo
*Copyright (c)2009-2013 D. R. Commander十三、Zxing
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