@Kartik Kanakasabesan @Derek Adam Thanks for your reply. I'm aware that WIP in RS5 is MIP label aware. However, Adobe Reader isn’t WIP aware, it only decrypts AIP protection with the currently announced plugin, it doesn’t differentiate between personal/work files.
Therefore, the user sees a prompt/warning when he tries to open a PDF file coming from any external source (the prompt basically says "Hello user, Adobe Reader isn't WIP enlightened application but your admin says you can use it anyway, we will therefore automatically apply WIP protection for the document and you can’t remove the protection, do you agree?"). This prompt is problematic for our users and causes a lot of confusion, they don’t understand difference between AIP, WIP, MIP, whatever. They just want to open a PDF file.
If Adobe Reader had proper MIP + WIP support (=if it were WIP enlightened app like Office), the user wouldn’t see the prompt and Reader would differentiate between personal/work content.