Patent ID: 8223968

Claim:
A non-transitory computer readable medium having stored therein a program to cause a computer to execute an operation, the operation comprising: registering, as original image data, image data of an original scanned by a scanner; extracting, from the registered original image data, partial information regarding each part of information forming the original image data, generating a feature value of each piece of the partial information, generating signature information including a set of the feature values and a signature attached to the set of the feature values, and registering the signature information in association with the original image data; performing, a print encryption operation on a portion to be concealed and registering partially print-encrypted original image data, and performing a digital encryption operation on the portion to be concealed and registering the digitally encrypted data, the print encryption operation allowing the original image to be yielded by decrypting a printed image of print-encrypted original image data; printing the original image data in response to a request to disclose the original image data that is encrypted and the portion as print data in accordance with the print encrypted original image data, and providing, in response to a request to disclose the original image data that is encrypted by an electronic medium, original image data in accordance with the digitally encrypted data.