Patent ID: 8705070

Claim:
An image acquisition device comprising: a computer-readable medium configured to store trust information, wherein the trust information is received from an identity provider in response to an establishment of a trust relationship with the identity provider; an image detector configured to capture an image, wherein the captured image includes a credential image, and wherein the credential image includes a credential issued by the identity provider and generated by the identity provider in response to a user authentication; and one or more processors configured to cause the device to perform operations including receiving the trust information from an identity provider device; capturing an image of a credential on a display medium, wherein the image of the credential was formed on the display medium by another device; identifying the credential in the image of the credential; determining if the credential is valid based on the trust information; and allowing user initiation of one or more predetermined operations by the device in response to determining that the credential is valid or disallowing user initiation of the one or more predetermined operations in response to determining that the credential is invalid.