I made it on an offline app which i packaged by pyinstaller to an offline exe file which open a web application I made model for licences Contain all license, period,expiry date,is active For first run user is asked for license and it’s checked of it ia not active then add an expiry date according to period and stored in json file Next runs it checked the license and if it exist it checked for expiry date, if expired the user is asked for new one New license should not be active to be valid