A system and method of authorizing a product including transmitting from an end user device a character string, including a Transaction ID, to a licensing authority. The licensing authority encrypts the Transaction ID using an encryption key associated with a product for which the end user is seeking authorization to produce an Authorization number. Each product is associated with a different encryption key resulting in a different Authorization number being produced for each product based on the same Transaction ID. The licensing authority then returns the Authorization number to the end user device. A decryption processor associated with the end user device decrypts the Authorization number using an unchangeable decryption key and compares the decrypted Authorization number with the Transaction ID. If the decrypted Authorization number matches the Transaction ID the product is authorized.