- Text Extraction
Xpdf & Open Source
Glyph & Cog distributes Xpdf under two different licenses:
- An open source license - the GNU General Public License (GPL)
- A commercial license - see the source
The open source Xpdf project provides a PDF viewer (for the X Window
System on Unix) and associated command line tools (which run on just
about any platform that has a C++ compiler). This free version of
Xpdf is licensed under the GPL (GNU General Public License), which
allows anyone to use the source in their own applications, as long as
they also distribute their application under the GPL.
For more details on the open source Xpdf project, visit the Xpdf web site.
Glyph & Cog is aware that open source can be a contentious issue,
but it has some advantages:
- Try before you buy: if you want to know how the XpdfText® library will perform on your
own PDF files, try out the pdftotext program from the Xpdf package -
the core text extraction engine is the same. Similarly for the
XpdfInfo library and the pdfinfo program.
- Look over the source code: if you're thinking about
licensing the Xpdf source code, download the Xpdf source and take a
- If you want to use the stand-alone executables (pdftotext
for example) with your application, you're free to do so. (To comply
with the GPL, you'll need to distribute the Xpdf documentation along
with the pdftotext executable - see the Xpdf README file for details.)
Of course, for maximum performance, we recommend using our libraries
or DLLs or building the Xpdf source code into your application.
We understand that open source isn't the right model for all
applications. That's why we sell the libraries as well as the commercial source license. This license allows you to
incorporate the Xpdf source code into your application, with no
restrictions on distribution.