Abstract: A printing device for printing print information sent from a computer via a communication line includes: a print information receiving unit for receiving via the communication line encrypted print information which has been generated by encrypting the print information in the computer using a password; a password receiving unit for receiving via the communication line an encrypted password which has been generated by encrypting the password in the computer; a password decryption unit for obtaining the password by decrypting the encrypted password received by the password receiving unit; a print information decryption unit for obtaining the print information by decrypting using the password the encrypted print information received by the print information receiving unit; and a printing unit for printing the print information obtained by the print information decryption unit on a predetermined print medium.