1. A printing system that performs printout based on encrypted, submitted data, the printing system comprising: a printing apparatus including a decrypting unit that decrypts the submitted data; and an editing apparatus that accepts an editing operation to be performed on the submitted data, wherein the editing apparatus transmits an execution instruction for performing a process of creating an image for editing used for the editing operation, to the printing apparatus, the printing apparatus performs, in response to the execution instruction, a process on an image obtained by decrypting the submitted data using the decrypting unit, and thereby creates a non-equivalent decrypted image as the image for editing, and transmits the non-equivalent decrypted image to the editing apparatus, the non-equivalent decrypted image being a decrypted image non-equivalent to a printed material related to the submitted data, and the editing apparatus displays the non-equivalent decrypted image as the image for editing.