15. The system of claim 12 , wherein the restricting availability of at least one function or feature of the computing device in accordance with the restriction information comprises: preventing storage of the unencrypted electronic document.
12. A system comprising: one or more processors; and one or more non-transitory computer-readable media including instructions that, when executed by the one or more processors, cause a computing device to perform operations comprising: receiving, at the computing device, a message output from an image processing device in accordance with an output mode that corresponds to a type of message, the message including location information for locating an encrypted electronic document stored on the image processing device, a key for decrypting the encrypted electronic document, and restriction information indicating a restriction associated with the encrypted electronic document, wherein receiving the message comprises receiving the type of message by performing, at the computing device, one or more operations in accordance with the type of message; sending, from the computing device to the image processing device, a request for the encrypted electronic document based on the location information; receiving, at the computing device from the image processing device, the encrypted electronic document based on the request; decrypting the encrypted electronic document using the key to generate an unencrypted electronic document, the unencrypted electronic document representing a scanned physical document; presenting an image of the unencrypted electronic document on a display of the computing device; and restricting availability of at least one function or feature of the computing device in accordance with the restriction information in order to restrict, at the computing device, use of at least one of the encrypted electronic document and the unencrypted electronic document.