Abstract: With the help of the key technologies in trusted computing(TC) including integrity measurement,access control and seal storage,a TC-based secure model for software protection was proposed.A trusted platform module(TPM),which is an extention of current USB port,is employed in this model to prevent software from illegal copying,unauthorized modification and implementation of software.The technologies,such as dynamic password-based authentication,role-based access control,code transformation and channel encryption.Compared with traditional schemes,the proposed model implements mutual identification between user and software via TPM,and authentication mechanism via role-based access control(RBAC).