A non-transitory computer-readable recording medium includes a shared library that is executed by a processor. The shared library includes a preprocessing function and a function. The function causes the processor to execute a process if a value, as an execution result of the preprocessing function, is valid, and not to execute the process if the value is invalid. The preprocessing function causes the processor to acquire encrypted unique information from the storage device, to decrypt the unique information, to acquire, from the storage device, specific information that specifies an application using the shared library, and to return the value that is valid or invalid based on a comparison between the specific information and the decrypted unique information.