PDFs in Moodle
From MoodleDocs
Portable Document Format (PDF) is an open standard for document exchange. Many activities in Moodle allow the option upload these as a resource and into the site or course file area.
Some activities and contributed code features allow Moodle to generate a PDF file. The default setting is to create an a file secure from further editing. The code for the PDF generator is located in ../lib/fpdf.