Initial commit

## Example files for the title:  

# PDF Explained, by John Whitington

[![PDF Explained, by John Whitington](http://akamaicovers.oreilly.com/images/9781449310011/cat.gif)](https://www.safaribooksonline.com/library/view/title/9781449321581//)

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Chapter 2: Building a Simple PDF

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helloworld-source.pdf: The manually-created file. This is not a valid PDF.

Open this in a text editor.

helloworld.pdf: The valid file, processed with pdftk. This may be opened

in a PDF viewer such as Acrobat. You can load it into a text editor to see

what pdftk has added.

The pdftk command was:

pdftk helloworld-source.pdf output helloworld.pdf