Apparatus with electronic information transfer function or the like, program for electronic information transfer, and method for electronic information transfer

A storage medium storing a program to be executed, by a computer, execution of the program causing the computer to perform a process comprising:

• generating an encrypted electronic information by encrypting electronic information with a public key which is received from another information processing apparatus, the electronic information being stored in a storage;
• erasing the electronic information from the storage;
• generating an electronic letter of credit which indicates that the electronic information has been erased by the erasing and the encrypted electronic information has been generated by the generating;
• and
• transmitting the encrypted electronic information and the electronic letter of credit to the another information processing apparatus only after erasing the electronic information from the storage.

A contents transfer method enabling transfer of electronic information via networks, comprising:

• generating an encrypted electronic information by encrypting electronic information with a public key which is received from another information processing apparatus, the electronic information being stored in a storage;
• erasing the electronic information from the storage;
• generating an electronic letter of credit which indicates that the electronic information has been erased by the erasing and the encrypted electronic information has been generated by the generating;
• and
• transmitting the encrypted electronic information and the electronic letter of credit to the another information processing apparatus only after erasing the electronic information from the storage by the erasing.