The "walled garden" is knowledge. To understand legalese, you have to know the definitions of the words. Specifically, you have to know the definitions as used by the courts. Many words have very precise legal definitions, which may or may not correspond with the non-legal definition.
Why is it that way? When you're writing a contract or a law, having words that let you state precisely what you mean saves a lot of trouble and confusion. We can go to court about people actually breaking the law or the contract, rather than about what the definition of "is" is.
And, as that snarky example illustrated, sometimes it doesn't work. Sometimes you wind up arguing exactly about the definition of words. But the precision of words in the legal community means that that happens a lot less often than it otherwise would.
Yes, there is a dual use, keeping information a trade secret, as well as good communication across legal or medical fraternities.
The trade and craft secrecy was mainly to mulct clients and restrict trade competition.
https://www.google.ca/search?q=mediaeval+trade+monopolies&oq...
Why is it that way? When you're writing a contract or a law, having words that let you state precisely what you mean saves a lot of trouble and confusion. We can go to court about people actually breaking the law or the contract, rather than about what the definition of "is" is.
And, as that snarky example illustrated, sometimes it doesn't work. Sometimes you wind up arguing exactly about the definition of words. But the precision of words in the legal community means that that happens a lot less often than it otherwise would.