*Device-Based Age Verification refers to any approach to age verification where the personal information that is used to verify the user’s age is either shared in-person at an authorized retailer, inputted locally into the user’s device, or stored on a network controlled by the device manufacturer or the supplier of the device’s operating system. Whether through pre-installed content blocking and filtering software, the disabling of web-browsing permissions, or other means, the user will then be prevented from accessing age-restricted content over the internet unless they are age-verified. To come to fruition, such an approach requires the cooperation of manufacturers and operating-system providers.

It literally explains what it is in the message.