This is a plugin for the "Workbook Maker".
Install it if you want use PDFs in "Workbook Maker".

"Workbook Maker" is a free app for creating your own workbook.

To use this plugin you must install "Workbook Maker" first.

This plugin is license under GPL V3
Source code can download from
http://usssy.net/android/mydrillbookmaker/code/mydrillbookmaker_pdf_plugin.zip

Read below for details of MuPDF
http://www.mupdf.com/

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