Patent ID: 7594274

Claim:
A method for authenticating applications performed on personal digital assistant (PDA), wherein said applications are installed in said personal digital assistant via a personal computer and wherein the registration information of said applications are registered and managed at a server unit connected via internet comprising: generating a unique ID from information which indicates unique hardware characteristics of the personal computer; transmitting the unique ID from the personal computer to said PDA; generating a virtual unique ID from said unique ID by said PDA and authenticating the application at the PDA with said virtual unique ID, wherein said virtual unique ID of said personal digital assistant is generated by transforming a format of said personal computer's unique ID in accordance with personal digital assistant's characteristics, wherein said authentication of said applications is performed through an authentication module including a registration information of said applications, and said authentication module is an encoded one, wherein said authentication module comprises: a first information for identifying whether said encoded authentication module is decoded correctly in case of decoding said encoded authentication module; and a second information for identifying whether said first information is transformed.