This does indeed seem to work for me, but the repeated emphasis on the patents and trademarks makes me suspicious. It looks like a company who cares much more about patent royalties than about their invention - whom I would never be willing to give my money to. Having seen the principle, I could write a browser extension in an hour. I suppose I'll have to wait 25 years (or whatever the French patent expiry length is), though.
If you want to read the patent (in French), it's here: https://data.inpi.fr/brevets/FR3052587. I couldn't find the German patent (10 2017 112 916.2), but I'm guessing it's the same substance.
If you want to read the patent (in French), it's here: https://data.inpi.fr/brevets/FR3052587. I couldn't find the German patent (10 2017 112 916.2), but I'm guessing it's the same substance.