A device for licensing a program including a header includes a storage device, a file system and a license verification component. The storage device is in a local terminal having a random access memory (RAM). The file system is configured in the storage device. The operating system (OS) receives a starting-program command to activate the program and stores the header into the storage device. The license verification component prevents the OS from loading the program in the RAM, and works with at least one of the OS and a remote server to perform a license verification, wherein after there is a license verification pass, the license verification component allows the program to be loaded in the RAM.