Legally right and morally right are two very different things.
As has been stated in many posts on this topic, China does not recognize out of country patent protection (a US patent only offers protection in the US anyway), copyright, trademark, or intellectual property rights, anyhow; thus seeking those protections is generally a waste of time, money (lots and lots of money), and effort.
So assuming a Caravela was patented, mind you there are only what 1000 of them, you might need to add around $20 per country if you decide you want your Caravela patent to be recognized everywhere in the world. That's 195 countries at $20,000 per patent divided amongst the 1000 Caravela mods, so the price just jumps up to +$3,900 for patent protection per Caravela.
An investment of 3.9 million dollars would be needed to get this world wide patent.
A mod maker is certainly not going to make enough mods to reduce the per mod patent cost to anything reasonable, let's say $5 that would take 780,000 mods, that market hardly exists even now. 10,000 is maybe reasonable, but that hikes the additional cost per mod to $390 for patent fees alone. There aren't 10,000 of any original authentic mods in existence that I know of. Maybe, but I'm not sure.
People who gripe about paying $39 for a tube and switch type mod aren't going to pay 10 times that plus cost ofaterials and a markup to cover profit and operating costs.
Protection from cloning, copying, mimicking, is simply prohibitive in this market.
Maurice