PURPOSE: To provide a method and device to distribute a software object from an author to a potential user in which tentative trial use period is allowed for the user without exposing the software product to such an undesired danger than a pirate act an undermitted use are conducted in excess of a tentative trial period.

CONSTITUTION: A cancelation-enable function limit is applied on a software object by ciphering preferably, and the result is loaded to a memory medium 213 accessible by a computer with a file management program. The medium 213 accessible by the computer is sent from an author 209 to a potential user 211. The file management program is loaded to the data processing system for user control and related to the operating system for data processing system for user control. The memory medium 213 accessible by the computer is read by the data processing system for user control and the file management program limits the access to the software object.