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-Xpdf
-====
-
-version 3.03
-2011-aug-15
-
-The Xpdf software and documentation are
-copyright 1996-2011 Glyph & Cog, LLC.
-
-Email: derekn@foolabs.com
-WWW: http://www.foolabs.com/xpdf/
-
-The PDF data structures, operators, and specification are
-copyright 1985-2006 Adobe Systems Inc.
-
-
-What is Xpdf?
--------------
-
-Xpdf is an open source viewer for Portable Document Format (PDF)
-files. (These are also sometimes also called 'Acrobat' files, from
-the name of Adobe's PDF software.) The Xpdf project also includes a
-PDF text extractor, PDF-to-PostScript converter, and various other
-utilities.
-
-Xpdf runs under the X Window System on UNIX, VMS, and OS/2. The non-X
-components (pdftops, pdftotext, etc.) also run on Windows and Mac OSX
-systems and should run on pretty much any system with a decent C++
-compiler. Xpdf will run on 32-bit and 64-bit machines.
-
-
-License & Distribution
-----------------------
-
-Xpdf is licensed under the GNU General Pulbic License (GPL), version 2
-or 3. This means that you can distribute derivatives of Xpdf under
-any of the following:
- - GPL v2 only
- - GPL v3 only
- - GPL v2 or v3
-
-The Xpdf source package includes the text of both GPL versions:
-COPYING for GPL v2, COPYING3 for GPL v3.
-
-Please note that Xpdf is NOT licensed under "any later version" of the
-GPL, as I have no idea what those versions will look like.
-
-If you are redistributing unmodified copies of Xpdf (or any of the
-Xpdf tools) in binary form, you need to include all of the
-documentation: README, man pages (or help files), COPYING, and
-COPYING3.
-
-If you want to incorporate the Xpdf source code into another program
-(or create a modified version of Xpdf), and you are distributing that
-program, you have two options: release your program under the GPL (v2
-and/or v3), or purchase a commercial Xpdf source license.
-
-If you're interested in commercial licensing, please see the Glyph &
-Cog web site:
-
- http://www.glyphandcog.com/
-
-
-Compatibility
--------------
-
-Xpdf is developed and tested on Linux.
-
-In addition, it has been compiled by others on Solaris, AIX, HP-UX,
-Digital Unix, Irix, and numerous other Unix implementations, as well
-as VMS and OS/2. It should work on pretty much any system which runs
-X11 and has Unix-like libraries. You'll need ANSI C++ and C compilers
-to compile it.
-
-The non-X components of Xpdf (pdftops, pdftotext, pdfinfo, pdffonts,
-pdfdetach, pdftoppm, and pdfimages) can also be compiled on Windows
-and Mac OSX systems. See the Xpdf web page for details.
-
-If you compile Xpdf for a system not listed on the web page, please
-let me know. If you're willing to make your binary available by ftp
-or on the web, I'll be happy to add a link from the Xpdf web page. I
-have decided not to host any binaries I didn't compile myself (for
-disk space and support reasons).
-
-If you can't get Xpdf to compile on your system, send me email and
-I'll try to help.
-
-Xpdf has been ported to the Acorn, Amiga, BeOS, and EPOC. See the
-Xpdf web page for links.
-
-
-Getting Xpdf
-------------
-
-The latest version is available from:
-
- http://www.foolabs.com/xpdf/
-
-or:
-
- ftp://ftp.foolabs.com/pub/xpdf/
-
-Source code and several precompiled executables are available.
-
-Announcements of new versions are posted to comp.text.pdf and emailed
-to a list of people. If you'd like to receive email notification of
-new versions, just let me know.
-
-
-Running Xpdf
-------------
-
-To run xpdf, simply type:
-
- xpdf file.pdf
-
-To generate a PostScript file, hit the "print" button in xpdf, or run
-pdftops:
-
- pdftops file.pdf
-
-To generate a plain text file, run pdftotext:
-
- pdftotext file.pdf
-
-There are five additional utilities (which are fully described in
-their man pages):
-
- pdfinfo -- dumps a PDF file's Info dictionary (plus some other
- useful information)
- pdffonts -- lists the fonts used in a PDF file along with various
- information for each font
- pdfdetach -- lists or extracts embedded files (attachments) from a
- PDF file
- pdftoppm -- converts a PDF file to a series of PPM/PGM/PBM-format
- bitmaps
- pdfimages -- extracts the images from a PDF file
-
-Command line options and many other details are described in the man
-pages (xpdf(1), etc.) and the VMS help files (xpdf.hlp, etc.).
-
-All of these utilities read an optional configuration file: see the
-xpdfrc(5) man page.
-
-
-Upgrading from Xpdf 3.02 (and earlier)
---------------------------------------
-
-The font configuration system has been changed. Previous versions
-used mostly separate commands to configure fonts for display and for
-PostScript output. As of 3.03, configuration options that make sense
-for both display and PS output have been unified.
-
-The following xpdfrc commands have been removed:
-* displayFontT1, displayFontTT: replaced with fontFile
-* displayNamedCIDFontT1, displayNamedCIDFontTT: replaced with fontFile
-* displayCIDFontT1, displayCIDFontTT: replaced with fontFileCC
-* psFont: replaced with psResidentFont
-* psNamedFont16: replaced with psResidentFont16
-* psFont16: replaced with psResidentFontCC
-
-See the xpdfrc(5) man page for more information on the new commands.
-
-Pdftops will now embed external 16-bit fonts (configured with the
-fontFileCC command) when the PDF file refers to a non-embedded font.
-It does not do any subsetting (yet), so the resulting PS files will be
-large.
-
-
-Compiling Xpdf
---------------
-
-See the separate file, INSTALL.
-
-
-Bugs
-----
-
-If you find a bug in Xpdf, i.e., if it prints an error message,
-crashes, or incorrectly displays a document, and you don't see that
-bug listed here, please send me email, with a pointer (URL, ftp site,
-etc.) to the PDF file.
-
-
-Acknowledgments
----------------
-
-Thanks to:
-
-* Patrick Voigt for help with the remote server code.
-* Patrick Moreau, Martin P.J. Zinser, and David Mathog for the VMS
- port.
-* David Boldt and Rick Rodgers for sample man pages.
-* Brendan Miller for the icon idea.
-* Olly Betts for help testing pdftotext.
-* Peter Ganten for the OS/2 port.
-* Michael Richmond for the Win32 port of pdftops and pdftotext and the
- xpdf/cygwin/XFree86 build instructions.
-* Frank M. Siegert for improvements in the PostScript code.
-* Leo Smiers for the decryption patches.
-* Rainer Menzner for creating t1lib, and for helping me adapt it to
- xpdf.
-* Pine Tree Systems A/S for funding the OPI and EPS support in
- pdftops.
-* Easy Software Products for funding several improvements to the
- PostScript output code.
-* Tom Kacvinsky for help with FreeType and for being my interface to
- the FreeType team.
-* Theppitak Karoonboonyanan for help with Thai support.
-* Leonard Rosenthol for help and contributions on a bunch of things.
-* Alexandros Diamantidis and Maria Adaloglou for help with Greek
- support.
-* Lawrence Lai for help with the CJK Unicode maps.
-
-Various people have contributed modifications made for use by the
-pdftex project:
-
-* Han The Thanh
-* Martin Schröder of ArtCom GmbH
-
-
-References
-----------
-
-Adobe Systems Inc., _PDF Reference, sixth edition: Adobe Portable
-Document Format version 1.7_.
-http://www.adobe.com/devnet/pdf/pdf_reference.html
-[The manual for PDF version 1.7.]
-
-Adobe Systems Inc., "Errata for the PDF Reference, sixth edition,
-version 1.7", October 16, 2006.
-http://www.adobe.com/devnet/pdf/pdf_reference.html
-[The errata for the PDF 1.7 spec.]
-
-Adobe Systems Inc., _PostScript Language Reference_, 3rd ed.
-Addison-Wesley, 1999, ISBN 0-201-37922-8.
-[The official PostScript manual.]
-
-Adobe Systems, Inc., _The Type 42 Font Format Specification_,
-Adobe Developer Support Technical Specification #5012. 1998.
-http://partners.adobe.com/asn/developer/pdfs/tn/5012.Type42_Spec.pdf
-[Type 42 is the format used to embed TrueType fonts in PostScript
-files.]
-
-Adobe Systems, Inc., _Adobe CMap and CIDFont Files Specification_,
-Adobe Developer Support Technical Specification #5014. 1995.
-http://www.adobe.com/supportservice/devrelations/PDFS/TN/5014.CIDFont_Spec.pdf
-[CMap file format needed for Japanese and Chinese font support.]
-
-Adobe Systems, Inc., _Adobe-Japan1-4 Character Collection for
-CID-Keyed Fonts_, Adobe Developer Support Technical Note #5078.
-2000.
-http://partners.adobe.com/asn/developer/PDFS/TN/5078.CID_Glyph.pdf
-[The Adobe Japanese character set.]
-
-Adobe Systems, Inc., _Adobe-GB1-4 Character Collection for
-CID-Keyed Fonts_, Adobe Developer Support Technical Note #5079.
-2000.
-http://partners.adobe.com/asn/developer/pdfs/tn/5079.Adobe-GB1-4.pdf
-[The Adobe Chinese GB (simplified) character set.]
-
-Adobe Systems, Inc., _Adobe-CNS1-3 Character Collection for
-CID-Keyed Fonts_, Adobe Developer Support Technical Note #5080.
-2000.
-http://partners.adobe.com/asn/developer/PDFS/TN/5080.CNS_CharColl.pdf
-[The Adobe Chinese CNS (traditional) character set.]
-
-Adobe Systems Inc., _Supporting the DCT Filters in PostScript Level
-2_, Adobe Developer Support Technical Note #5116. 1992.
-http://www.adobe.com/supportservice/devrelations/PDFS/TN/5116.PS2_DCT.PDF
-[Description of the DCTDecode filter parameters.]
-
-Adobe Systems Inc., _Open Prepress Interface (OPI) Specification -
-Version 2.0_, Adobe Developer Support Technical Note #5660. 2000.
-http://partners.adobe.com/asn/developer/PDFS/TN/5660.OPI_2.0.pdf
-
-Adobe Systems Inc., CMap files.
-ftp://ftp.oreilly.com/pub/examples/nutshell/cjkv/adobe/
-[The actual CMap files for the 16-bit CJK encodings.]
-
-Adobe Systems Inc., Unicode glyph lists.
-http://partners.adobe.com/asn/developer/type/unicodegn.html
-http://partners.adobe.com/asn/developer/type/glyphlist.txt
-http://partners.adobe.com/asn/developer/type/corporateuse.txt
-http://partners.adobe.com/asn/developer/type/zapfdingbats.txt
-[Mappings between character names to Unicode.]
-
-Adobe Systems Inc., OpenType Specification v. 1.4.
-http://partners.adobe.com/public/developer/opentype/index_spec.html
-[The OpenType font format spec.]
-
-Aldus Corp., _OPI: Open Prepress Interface Specification 1.3_. 1993.
-http://partners.adobe.com/asn/developer/PDFS/TN/OPI_13.pdf
-
-Anonymous, RC4 source code.
-ftp://ftp.ox.ac.uk/pub/crypto/misc/rc4.tar.gz
-ftp://idea.sec.dsi.unimi.it/pub/crypt/code/rc4.tar.gz
-[This is the algorithm used to encrypt PDF files.]
-
-T. Boutell, et al., "PNG (Portable Network Graphics) Specification,
-Version 1.0". RFC 2083.
-[PDF uses the PNG filter algorithms.]
-
-CCITT, "Information Technology - Digital Compression and Coding of
-Continuous-tone Still Images - Requirements and Guidelines", CCITT
-Recommendation T.81.
-http://www.w3.org/Graphics/JPEG/
-[The official JPEG spec.]
-
-A. Chernov, "Registration of a Cyrillic Character Set". RFC 1489.
-[Documentation for the KOI8-R Cyrillic encoding.]
-
-Roman Czyborra, "The ISO 8859 Alphabet Soup".
-http://czyborra.com/charsets/iso8859.html
-[Documentation on the various ISO 859 encodings.]
-
-L. Peter Deutsch, "ZLIB Compressed Data Format Specification version
-3.3". RFC 1950.
-[Information on the general format used in FlateDecode streams.]
-
-L. Peter Deutsch, "DEFLATE Compressed Data Format Specification
-version 1.3". RFC 1951.
-[The definition of the compression algorithm used in FlateDecode
-streams.]
-
-Morris Dworkin, "Recommendation for Block Cipher Modes of Operation",
-National Institute of Standards, NIST Special Publication 800-38A,
-2001.
-[The cipher block chaining (CBC) mode used with AES in PDF files.]
-
-Federal Information Processing Standards Publication 197 (FIPS PUBS
-197), "Advanced Encryption Standard (AES)", November 26, 2001.
-[AES encryption, used in PDF 1.6.]
-
-Jim Flowers, "X Logical Font Description Conventions", Version 1.5, X
-Consortium Standard, X Version 11, Release 6.1.
-ftp://ftp.x.org/pub/R6.1/xc/doc/hardcopy/XLFD/xlfd.PS.Z
-[The official specification of X font descriptors, including font
-transformation matrices.]
-
-Foley, van Dam, Feiner, and Hughes, _Computer Graphics: Principles and
-Practice_, 2nd ed. Addison-Wesley, 1990, ISBN 0-201-12110-7.
-[Colorspace conversion functions, Bezier spline math.]
-
-Robert L. Hummel, _Programmer's Technical Reference: Data and Fax
-Communications_. Ziff-Davis Press, 1993, ISBN 1-56276-077-7.
-[CCITT Group 3 and 4 fax decoding.]
-
-ISO/IEC, _Information technology -- Lossy/lossless coding of bi-level
-images_. ISO/IEC 14492, First edition (2001-12-15).
-http://webstore.ansi.org/
-[The official JBIG2 standard. The final draft of this spec is
-available from http://www.jpeg.org/jbighomepage.html.]
-
-ISO/IEC, _Information technology -- JPEG 2000 image coding system --
-Part 1: Core coding system_. ISO/IEC 15444-1, First edition
-(2000-12-15).
-http://webstore.ansi.org/
-[The official JPEG 2000 standard. The final committee draft of this
-spec is available from http://www.jpeg.org/JPEG2000.html, but there
-were changes made to the bitstream format between that draft and the
-published spec.]
-
-ITU, "Standardization of Group 3 facsimile terminals for document
-transmission", ITU-T Recommendation T.4, 1999.
-ITU, "Facsimile coding schemes and coding control functions for Group 4
-facsimile apparatus", ITU-T Recommendation T.6, 1993.
-http://www.itu.int/
-[The official Group 3 and 4 fax standards - used by the CCITTFaxDecode
-stream, as well as the JBIG2Decode stream.]
-
-B. Kaliski, "PKCS #5: Password-Based Cryptography Specification,
-Version 2.0". RFC 2898.
-[Defines the padding scheme used with AES encryption in PDF files.]
-
-Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz, "Practical
-Fast 1-D DCT Algorithms with 11 Multiplications". IEEE Intl. Conf. on
-Acoustics, Speech & Signal Processing, 1989, 988-991.
-[The fast IDCT algorithm used in the DCTDecode filter.]
-
-Microsoft, _TrueType 1.0 Font Files_, rev. 1.66. 1995.
-http://www.microsoft.com/typography/tt/tt.htm
-[The TrueType font spec (in MS Word format, naturally).]
-
-V. Ostromoukhov, R.D. Hersch, "Stochastic Clustered-Dot Dithering",
-Conf. Color Imaging: Device-Independent Color, Color Hardcopy, and
-Graphic Arts IV, 1999, SPIE Vol. 3648, 496-505.
-http://diwww.epfl.ch/w3lsp/publications/colour/scd.html
-[The stochastic dithering algorithm used in Xpdf.]
-
-P. Peterlin, "ISO 8859-2 (Latin 2) Resources".
-http://sizif.mf.uni-lj.si/linux/cee/iso8859-2.html
-[This is a web page with all sorts of useful Latin-2 character set and
-font information.]
-
-Charles Poynton, "Color FAQ".
-http://www.inforamp.net/~poynton/ColorFAQ.html
-[The mapping from the CIE 1931 (XYZ) color space to RGB.]
-
-R. Rivest, "The MD5 Message-Digest Algorithm". RFC 1321.
-[MD5 is used in PDF document encryption.]
-
-Thai Industrial Standard, "Standard for Thai Character Codes for
-Computers", TIS-620-2533 (1990).
-http://www.nectec.or.th/it-standards/std620/std620.htm
-[The TIS-620 Thai encoding.]
-
-Unicode Consortium, "Unicode Home Page".
-http://www.unicode.org/
-[Online copy of the Unicode spec.]
-
-W3C Recommendation, "PNG (Portable Network Graphics) Specification
-Version 1.0".
-http://www.w3.org/Graphics/PNG/
-[Defines the PNG image predictor.]
-
-Gregory K. Wallace, "The JPEG Still Picture Compression Standard".
-ftp://ftp.uu.net/graphics/jpeg/wallace.ps.gz
-[Good description of the JPEG standard. Also published in CACM, April
-1991, and submitted to IEEE Transactions on Consumer Electronics.]
-
-F. Yergeau, "UTF-8, a transformation format of ISO 10646". RFC 2279.
-[A commonly used Unicode encoding.]