The invention provides a design method of an authorized license in a mobile digital copyright system. An authorization generation request received from an authorization distribution module comprises user information, user domain name information, device information, a user public key certificate and user signature information, and the method comprises the following steps: sending the user public key certificate and the user signature information to a secure engine system to request to verify user identity, finding a product identifier after the verification is passed, sending the product identifier to a secret key management system, generating authorization to be signed based on right expression language after obtaining an encrypted product secret key returned by the secret key management system, sending the authorization to be signed to the secure engine system to request for signature, generating a final authorization file after obtaining the signature information returned by the secure engine system, and sending the final authorization file to an authorization management and authorization distribution module.