It hasn't been a big issue at CU, but we've had that come up over tax season when folks try to print out IRS forms. Some of them are locked. Our experience was that they never made it to the queue. We seem to have more issues involving students wanting to print one page out of X number of pages of a PDF, but the document won't allow it, or the document isn't printable at all (usually locked down practice exams, apparently no one thought about screen captures ).
What happens when these jobs printed via Uniprint or Mobileprint without using MPC?
We have this as a feature request we are working on. The initial plan is to simply have the system recognize documents that are locked as you describe, and alert the user that these are unsupported. This will prevent the accidental charge for a document that is unprintable. We are also investigating ways to potentially ask for passwords upon release. Again, that's secondary and will take more time. Look forward to a product update in the future for this issue.
Cool, at our location, a "document not supported" message would help get rid of a lot of the Pharos\Xerox never works with PDF's complaints! : )
+1 On that - we'd love to see this additional feature to make PDF issues more manageable.