Xpdf

Xpdf is a free and open-source PDF viewer for operating systems supported by the Qt toolkit.[3] Versions prior to 4.00 were written for the X Window System and Motif.[5]

Xpdf
The Xpdf viewer
Developer(s)Glyph & Cog
Initial releaseDecember 12, 1995 (1995-12-12)
Stable release
4.02 / September 25, 2019 (2019-09-25)
Operating systemCross-platform
TypePDF viewer
LicenseGNU GPLv2 only,[1] GPLv3 only[2] or proprietary[3][4]
Websitexpdfreader.com

Xpdf runs on nearly any Unix-like operating system. Binaries are also available for Windows. Xpdf can decode LZW and read encrypted PDFs. The official version obeys the DRM restrictions of PDF files,[6] which can prevent copying, printing, or converting some PDF files.[3] There are patches that make Xpdf ignore these DRM restrictions,[7] and these restrictions are patched out by the Debian distribution.[8]

Xpdf includes several programs that don't need an X Window System, including some that extract images from PDF files or convert PDF to PostScript or text. These programs run on DOS, Windows, Linux and Unix.[3]

Xpdf is also used as a back-end for other PDF readers frontends such as KPDF and GPDF,[5] and its engine, without the X11 display components, is used for PDF viewers including BePDF on BeOS, '!PDF' on RISC OS, on PalmPDF[9] on Palm OS[3] and on Windows Mobile.[10]

Two versions exist for AmigaOS. Xpdf needs a limited version of an X11 engine called Cygnix on the host system. AmigaOS 4 included AmiPDF, a PDF viewer based on 3.01 version of the Xpdf. However both Apdf and AmiPDF are native and need no X11.

xpdf-utils

The associated package "xpdf-utils" or "poppler-utils" contains tools such as pdftotext and pdfimages.

gollark: You do realise, though, that even with free *material goods*, you do still need, say, spaceship designers? Material scarcity and general scarcity are separate.
gollark: Yes it does.
gollark: Some episodes later... "We need X spare part for the spaceship!"
gollark: "Oh look let's just stick in this convenient FUTURE thing so our captain has coffee"
gollark: They never do consider the consequences of replicators, really.

See also

Notes and references
  1. about on foolabs.com "Xpdf is licensed under the GNU General Public License (GPL), version 2. In my opinion, the GPL is a convoluted, confusing, ambiguous mess. But it's also pervasive, and I'm sick of arguing. And even if it is confusing, the basic idea is good. "
  2. xpdf xpdf 3.03 "The license was changed from GPLv2 to dual v2/v3 licensing."
  3. Xpdf website
  4. Glyph & Cog, LLC: Xpdf
  5. Polzer, Leslie (2006-11-28). "A survey of Linux PDF viewers". SourceForge, Inc. Retrieved 2007-08-30.
  6. Xpdf - Cracking
  7. Generic Xpdf Patch Instructions
  8. Okular, Debian, and copy restrictions
  9. PalmPDF
  10. PocketXpdf

Sources
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