Depending on the package you will find the licensed Pilz ROS packages under Apache License Version 2.0 or GNU Lesser General Public License version 3 (LGPL).
You can find more information about the Pilz ROS package on ROS Wiki:
Robotics
What licences do I need to use the Pilz ROS packages?
Contact
Pilz Ireland
Cork Business and Technology Park, Model Farm Road
Cork
Ireland
Telephone: +353 21 4346535
E-Mail: sales@pilz.ie
Technical Support
Telephone: +353 21 4804983
E-Mail: sales@pilz.ie