「我未曾深入研究，也不認為這是我的職責範圍。」
This is the problem with u/fermaw’s “DRM.” No matter how many clever keys, nonces, and encrypted file formats he attempts to send to the user, eventually, the very same JavaScript code will need to exit his decryption logic and—whoops—it goes plain Jane into digital and straight to the speakers.
，这一点在服务器推荐中也有详细论述
Scroll to load interactive demo
The core of OsmAnd's HH-Routing is an elegant two-level hierarchy built upon "area clusters."