No necesitas saber nada técnico, esto es lo que pone en las condiciones legales en la web de riot
9.1. Does Riot monitor me while using the Riot Services? (Yes. Please read the Privacy Notice to learn more.)
We may actively monitor the use of the Riot Services (but have no obligation to do so), both on our own servers and on your computer or device, for a wide variety of different purposes, including preventing cheating and hacking, reducing toxic player behavior, and improving the Riot Services. Please be sure to read our Privacy Notice for important details about how we obtain and process info in connection with your use of the Riot Services.
9.2. Does Riot run programs on my device while I’m not using the Riot Services? (We may, for limited anti-cheat purposes.)In order to prevent cheating and hacking, we may require you to install anti-cheat software. This software may run in the background of your device.
Usando Vanguard les das permiso para que escaneen todo tu ordenador y envíen la información que quieran de lo que han encontrado a sus servidores.