Fast and Robust Recognition of PDF417 Codes This licenses include pylon vTools for PDF417 code recognition and decoding. These easy-to-use tools provide the fastest route to exceptional PDF417 code recognition with unmatched accuracy.pylon vTools are part of Basler's pylon Software Suite. Licenses for pylon vTools can be protected by hardware dongles. If you want to run multiple systems with pylon vTools at the same time, you will need one dongle for each system.