Maybe this belongs in a Reader forum somewhere but I arrived at the issue / question through testing LiveCycle Rights Management so I'm starting here ...
I'm seeing some odd behavior accessing policy-protected documents.
Adobe Reader appears to cache the username / password to make it easier for you to open multiple policy-protected pdfs in the same session. There appears to be a problem, however, if you use more than one valid username / password combination to open documents secured by the same LiveCycle server.
Say you Person A routinely use both User A and User B for opening policy protected documents that have been protected by LiveCycle server A.
If you open Document A that only allows User A to access it and you provide your User A username and password, you can open the document just fine. If you then try to open Document B that only allows User B to access it, you will not be given an opportunity to enter User B's username and password. Instead you receive the "This document is locked. You do not have permission to open it. Contact the person who sent you this document and ask them to give you permission to open it." error message.
You will not have an opportunity to enter User B's username and password until you 1) forcibly terminate AcroRd32.exe OR reboot your PC.
I'm using LiveCycle 8.2 SP2 and Reader 8.1.4 (KB 408682).
Can anyone replicate this behavior? Is this to be expected?