A demo watermark is generated without a license.

A license code is passed before opening a project:
# Init report engine
# valentina.project.init('VRPTN-M-*', 'VRPTN-W-*', 'VRPTN-L-*')

Please do I pass license code do I pass before opening the project ?

Also, the line below looks like a comment in python to me. I am a bit confused here

#valentina.project.init('VRPTN-M-*', 'VRPTN-W-*', 'VRPTN-L-*')

It's from the example report.py, just uncomment and place before valentina.project.connect