When generating reports in OpManager v11 and exporting as PDF, the footer contains ManageEngine OpManager Page : as the footer.
To change this, on your OpManager install, navigate to the installation path of OpManager and modify confrandProps.properties file. Add the following line, and customize accordingly.
pdfFooterText=Your Company or Whatever | email@example.com | Page:
You do not need quotes surrounding the pdfFooterText variable.
Save the file and go generate a report and export to PDF. Enjoy!