Alerting users to failed PDF Creation

Hi, We have been battling an increase in users suggesting there is a fault with PDFCreator when sending documents to print (we have it set to email back a converted PDF).

The symptoms are that they never receive a PDF. It seems however that after a bit of hunting around and discussing the problem we have a group of users who are sending encrypted PDFs to print in an effort to split the document and receive back another PDF with only the pages they need.

The event log shows

"This PostScript file was created from an encrypted PDF file.
Redistilling encrypted PDF is not permitted."

Has anyone come up with a way of alerting the users to the fact that this is correct behaviour? I'm thinking about maybe a return email with some guidance about how they cannot redistill this type of document and offering alternative options.

Anyone come up with any clever solutions?