I doubt that there is anyway to protect the disk from copying in Powerdirector.
Even commercial DVDs can be copied with the right software.
It might be a good idea to put a copyright notice on the DVD as a first play video.
You may not be able to stop someone from copying the DVD, but you sure can tell them on the DVD copying is not allowed.
Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.