Execution device, instruction device, method executed by same, and computer program

A computer program for causing a predetermined computer to function as an execution device that is used in combination with a user hand-held instruction device that is a device capable of transferring an instruction serving as a trigger for performing an operation, and performs an operation when receiving an instruction from the user hand-held instruction device, wherein the user hand-held instruction device is configured to generate encrypted condition data by encrypting condition data of a plain text which is data for specifying a condition relating to actions of a user to be satisfied when or before or after the instruction is transferred to the execution device, and transfer the encrypted condition data to the execution device, thereby performing the instruction, the computer program causing the computer to execute:

• a reception step of receiving the encrypted condition data;
• a decryption step of decrypting the encrypted condition data to return the encrypted condition data to the condition data;
• a determination step of receiving, from an action data generating device for generating action data that is data specifying an action the user has actually performed, the action data being delivered when or before or after the instruction is transferred to the execution device and of determining whether the condition relating to actions of a user specified by the condition data is satisfied;
• and
• an execution step for executing a first operation that is only one predetermined type of operation as the operation when the determination means determines that the condition relating to actions of a user specified by the condition data is satisfied.