1. A computer implemented method for verifying ownership of a physical work, the method comprising: a) instructing a user to uniquely mark a first specified unmarked portion of the physical work in a specified way; b) instructing the user to capture one or more camera images of one or more specified portions of the physical work, including the first specified portion subsequent to unique marking thereof; c) providing data to a computer, said data including said one or more camera images in digital format; d) analyzing the one or more camera images by the computer to determine whether one or more predetermined conditions have been fulfilled, wherein said one or more predetermined conditions include verification that the user has marked the first specified portion of the physical work in the specified way; and e) upon determining that said one or more predetermined conditions have been fulfilled, verifying, by the computer, ownership of the physical work; wherein said instructing the user to mark the first specified portion of the physical work and said instructing the user to capture one or more camera images is performed by a personal electronic device.