Information Rights Management (IRM): Protector %1 threw an exception during a call to its HrUnprotect() function. Protector: ...

Information Rights Management (IRM): Protector %1 threw an exception during a call to its HrUnprotect() function.
Protector: %2
Current file: %3
GUID of current list: %4

HrUnprotect() removes IRM protection from a file of the protector's file type.  It is typically called when a user uploads a file to the server.