Although the patent laws of different countries are different, the contents of the invention should be made public. Once the invention is made public, there are no secrets.
In fact, the patent system is open in exchange for legal protection.
For a formula like Coca-Cola, the patent protection can only be used exclusively for 20 years at most. After the patent expires, the formula becomes a well-known technology and the public can use it for free. However, through the protection of technical secrets, as long as the secrets are not made public, they can be used exclusively indefinitely.