Thanks for highlighting the password in source code and apologies for the misunderstanding.
We have tested the scenario in our environment and observed that API was throwing an Exception, while Document initialization. However for the sake of detailed investigation, we have logged a ticket as PDFNET-43013 against the issue, in our issue tracking system.
We will further investigate the reasons behind this issue and keep you posted with the status of its correction. Please be patient and spare us little time.
We are sorry for the inconvenience.