We use key technology to deal with the issue. User generates a local key in his/her computer device and sent it to the owner. The owner produces a new key based on the local key. The user could only open the PDF document with the owners public key in the authorized device (the computer the user generates the local key). In other computers, the open request will be denied. Our built-in PDF viewer could also restrict the readers from accessing permissions. In current version, our viewer only allows users to read rather than copying, editing, saving, converting and printing.
Main Features: Generate local keys. Generate owner's keys. Pair local keys and owner's keys. Lock PDF to specific computers. Stop PDF printing, copying, editing, saving and converting. Stop PDF being distributed and opened by unauthorized users.