I wonder if there would be a way to "pair" all of your transceivers with each other in such a way as to prevent triggers from devices that the receiving unit does not "know?" Something similar to the way a bluetooth headset pairs with a smartphone?
Aside from the one guy I mentioned in my earlier post who seemed to think that the University's gym light system was roughly the photographers's equivalent to free wi-fi, I have had pretty much zero trouble with anyone trying to take over my lights. As with so many things, there is a bad egg from time to time, but the vast majority of folks just want to stay out of your way, and at the most maybe just pick up a few pointers.
I've thought about this quite a bit since this post first appeared, and it seems to me this problem has the potential to get a lot worse. In the past there has been a measure of protection in using PocketWizard MultiMax units. The reasons for this are that the higher cost of these would limit the number of people who would buy them and be tempted to use them for mischief and because of their 28 additional channels above the four that exist on a Plus or Plus II (or the 10 or 16 channels on a PocketWizard Classic). Now, it seems to me that PocketWizard, even as their products make possible sophistication in photography that could hardly even be imagined before, is allowing the problem to grow worse by making the 32-channel Plus III available even cheaper than than the Plus II was.
Since I shoot swimming a fair amount, this concerns me quite a bit because there are specific restrictions on flash lighting at these types of events. If I didn't think I could maintain total control over my system, it would be irresponsible for me to not just pull the plug. There could be hazards to the integrity of the competition and even the safety of the athletes if a jerk were able to discharge the lights at times not of my choosing.
Obviously, I don't think it would be desirable or even that helpful to arbitrarily jack up the price of Plus III's in an attempt to prevent mischief, but I hope PocketWizard has some kind of security/encryption on the drawing board for their units.