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About Expat

Copyright (C) 1998, 1999, 2000 Thai Open Source Software Center Ltd

and Clark Cooper

Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Expat maintainers.

Permission is hereby granted, free of charge, to any person obtaining a copy of this 
software and associated documentation files (the “Software”), to deal in the Software 
without restriction, including without limitation the rights to use, copy, modify, merge, 
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons 
to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or 
substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY 
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS 
OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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About cURL

COPYRIGHT AND PERMISSION NOTICE
Copyright (C) 1996 - 2009, Daniel Stenberg, <daniel@haxx.se>.
All rights reserved.
Permission to use, copy, modify, and distribute this software for any purpose with or 
without fee is hereby granted, provided that the above copyright notice and this 
permission notice appear in all copies.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY 
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO 
EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
THE SOFTWARE.
Except as contained in this notice, the name of a copyright holder shall not be used in 
advertising or otherwise to promote the sale, use or other dealings in this Software 
without prior written authorization of the copyright holder.

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About Independent JPEG group

The Independent JPEG Group’s JPEG software

README for release 7 of 27-Jun-2009

This distribution contains the seventh public release of the Independent JPEG Group’s 
free JPEG software. You are welcome to redistribute this software and to use it for any 
purpose, subject to the conditions under LEGAL ISSUES, below.
This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone, Bill 
Allombert, Jim Boucher, Lee Crocker, Bob Friesenhahn, Ben Jackson, Julian 
Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge’ Weijers, and other members 
of the Independent JPEG Group.
IJG is not affiliated with the official ISO JPEG standards committee.

DOCUMENTATION ROADMAP
This file contains the following sections:
OVERVIEW

General description of JPEG and the IJG software.

LEGAL ISSUES

Copyright, lack of warranty, terms of distribution.

REFERENCES

Where to learn more about JPEG.

ARCHIVE LOCATIONS

Where to find newer versions of this software.

ACKNOWLEDGMENTS

Special thanks.

FILE FORMAT WARS

Software *not* to get.

TO DO

Plans for future IJG releases.

Other documentation files in the distribution are:
User documentation:

install.txt

How to configure and install the IJG software.

usage.txt

Usage instructions for cjpeg, djpeg, jpegtran, rdjpgcom, and 
wrjpgcom.

*.1

Unix-style man pages for programs (same info as usage.txt).

wizard.txt

Advanced usage instructions for JPEG wizards only.

change.log

Version-to-version change highlights.

Programmer and internal documentation:

libjpeg.txt

How to use the JPEG library in your own programs.

example.c

Sample code for calling the JPEG library.

structure.txt

Overview of the JPEG library’s internal structure.

filelist.txt

Road map of IJG files.

coderules.txt

Coding style rules --- please read if you contribute code.

Please read at least the files install.txt and usage.txt. Some information can also be 
found in the JPEG FAQ (Frequently Asked Questions) article. See ARCHIVE 
LOCATIONS below to find out where to obtain the FAQ article.
If you want to understand how the JPEG code works, we suggest reading one or more 
of the REFERENCES, then looking at the documentation files (in roughly the order 
listed) before diving into the code.
OVERVIEW

This package contains C software to implement JPEG image encoding, decoding, and 
transcoding. JPEG (pronounced “jay-peg”) is a standardized compression method for 
full-color and gray-scale images.
This software implements JPEG baseline, extended-sequential, and progressive 
compression processes. Provision is made for supporting all variants of these processes, 
although some uncommon parameter settings aren’t implemented yet. We have made 
no provision for supporting the hierarchical or lossless processes defined in the 
standard.
We provide a set of library routines for reading and writing JPEG image files, plus two 
sample applications “cjpeg” and “djpeg”, which use the library to perform conversion 
between JPEG and some other popular image file formats. The library is intended to be 
reused in other applications.
In order to support file conversion and viewing software, we have included 
considerable functionality beyond the bare JPEG coding/decoding capability; for 
example, the color quantization modules are not strictly part of JPEG decoding, but 
they are essential for output to colormapped file formats or colormapped displays. 
These extra functions can be compiled out of the library if not required for a particular 
application.
We have also included “jpegtran”, a utility for lossless transcoding between different 
JPEG processes, and “rdjpgcom” and “wrjpgcom”, two simple applications for 
inserting and extracting textual comments in JFIF files.
The emphasis in designing this software has been on achieving portability and 
flexibility, while also making it fast enough to be useful. In particular, the software is 
not intended to be read as a tutorial on JPEG. (See the REFERENCES section for 
introductory material.) Rather, it is intended to be reliable, portable, industrial-strength 
code. We do not claim to have achieved that goal in every aspect of the software, but 
we strive for it.
We welcome the use of this software as a component of commercial products. No 
royalty is required, but we do ask for an acknowledgement in product documentation, 
as described under LEGAL ISSUES.
LEGAL ISSUES
In plain English:
1. We don’t promise that this software works. (But if you find any bugs, please let us 
know!)
2. You can use this software for whatever you want. You don’t have to pay us.
3. You may not pretend that you wrote this software. If you use it in a program, you 
must acknowledge somewhere in your documentation that you’ve used the IJG code.
In legalese:
The authors make NO WARRANTY or representation, either express or implied, with 
respect to this software, its quality, accuracy, merchantability, or fitness for a particular 
purpose. This software is provided “AS IS”, and you, its user, assume the entire risk as 
to its quality and accuracy.
This software is copyright (C) 1991-2009, Thomas G. Lane, Guido Vollbeding.
All Rights Reserved except as specified below.
Permission is hereby granted to use, copy, modify, and distribute this software (or 
portions thereof) for any purpose, without fee, subject to these conditions:
(1) If any part of the source code for this software is distributed, then this README file 
must be included, with this copyright and no-warranty notice unaltered; and any 
additions, deletions, or changes to the original files must be clearly indicated in 
accompanying documentation.
(2) If only executable code is distributed, then the accompanying documentation must 
state that “this software is based in part on the work of the Independent JPEG Group”.
(3) Permission for use of this software is granted only if the user accepts full 
responsibility for any undesirable consequences; the authors accept NO LIABILITY for 
damages of any kind.
These conditions apply to any software derived from or based on the IJG code, not just 
to the unmodified library. If you use our work, you ought to acknowledge us.
Permission is NOT granted for the use of any IJG author’s name or company name in 
advertising or publicity relating to this software or products derived from it. This 
software may be referred to only as “the Independent JPEG Group’s software”.
We specifically permit and encourage the use of this software as the basis of 
commercial products, provided that all warranty or liability claims are assumed by the 
product vendor.
ansi2knr.c is included in this distribution by permission of L. Peter Deutsch, sole 
proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA. ansi2knr.c is 
NOT covered by the above copyright and conditions, but instead by the usual 
distribution terms of the Free Software Foundation; principally, that you must include 
source code if you redistribute it. (See the file ansi2knr.c for full details.) However, 
since ansi2knr.c is not needed as part of any program generated from the IJG code, this 
does not limit you more than the foregoing paragraphs do.
The Unix configuration script “configure” was produced with GNU Autoconf. It is 
copyright by the Free Software Foundation but is freely distributable. The same holds 
for its supporting scripts (config.guess, config.sub, ltmain.sh).  Another support script, 
install-sh, is copyright by X Consortium but is also freely distributable.
The IJG distribution formerly included code to read and write GIF files. To avoid 
entanglement with the Unisys LZW patent, GIF reading support has been removed 
altogether, and the GIF writer has been simplified to produce “uncompressed GIFs”. 
This technique does not use the LZW algorithm; the resulting GIF files are larger than 
usual, but are readable by all standard GIF decoders.
We are required to state that

“The Graphics Interchange Format(c) is the Copyright property of

CompuServe Incorporated. GIF(sm) is a Service Mark property of
CompuServe Incorporated.”

REFERENCES
We recommend reading one or more of these references before trying to understand the 
innards of the JPEG software.
The best short technical introduction to the JPEG compression algorithm is

Wallace, Gregory K.  “The JPEG Still Picture Compression Standard”,