Ancestral plaster

I was just about to ask this question. I checked some information, and the best way is to keep it secret, and more people will know it slowly. I really should have said that, the smell of wine is not afraid of the depth of the alley. Because applying for a patent requires a specific formula and processing technology, it is public, that is, a 20-year patent will be made public 20 years later and anyone can use it.