If users install an app, they give consent to sharing private information — but their friends do not. (theprint.in)
You understand that a withdrawal of consent to use your personal information may affect your ability to use the website and / or our ability to provide you with information, products or services. (petsmartcharities.ca)
It also requires a student's parents to consent to such research and / or video monitoring. (law.stackexchange.com)