Apple obtained a lot of licensing fees by licensing interface technology to third-party manufacturers. By bundling with third-party accessories suppliers, Apple increased users' loyalty and further pulled users into Apple's ecosystem.
If you want to apply for a patent, the authentication technology in the chip must be made public, which is undoubtedly to remove your technical threshold in vain and give the cottage manufacturer a big gift package.
The above is a copy, which means if he doesn't tell you the electrical characteristics of his interface, how do you make your adapter? Then you have to do it, you have to ask him for information, and then he will charge you. But if he applies for a patent, it is equivalent to propaganda, and he can't stop the cottage manufacturers. In addition, if you are a small company, don't worry, even if Apple wants to sue you for compensation, it can't even pay his lawyer's fee. He will only sue Samsung, at least at the level of Gionee oppo.