A method of printing comprising, at an imaging device, receiving a print-by-reference print request and an encryption key from a mobile device, transmitting the print-by-reference print request and the encryption key to a print service, receiving encrypted print content from the print service, receiving a decryption key from the mobile device, decrypting the encrypted print content, creating decrypted print content, and printing the decrypted print content. A method of printing content requested from a mobile device, comprising receiving a print request and encrypted print content, receiving a decryption key from the mobile device, decrypting the encrypted print content, and printing the decrypted print content.