Activation expires in 90 days, reducing several development functions of a TestKit/DevKit
File is generated on request by Sony and tied to console internal serial
The activation key is a xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx string (where x = hexadecimal)
If the Activation Key was expired, the PS4 shows the following (Error) Message on the Main Menu: "This Development Kit is Expired. See DEVKIT_Activation-Users_Guide."
Neighborhood for PS4, does not require any activation like the rumors and previous edit says. But an unactivated PS4 can't run fselfs.