1. A computer implemented method for unlocking digital content embodied in digital readable form on a digital media carrier, the method comprises: storing by a computer, an association of a printed publication with digital content; storing, by the computer, an arrangement of text from the associated physical copy of the printed publication; selecting randomly by the computer a page number of the printed publication; producing by the computer a test that includes the randomly selected page number of the printed publication to scan; changing by the computer the randomly selected page number of the test with each attempt at unlocking the digital content; receiving by the computer a request to unlock the digital content; transmitting, by the computer, the test; receiving, by the computer, an image; determining by the computer whether the image corresponds to the randomly selected page of the printed publication, by: applying optical character recognition to the received image to produce data that represents an arrangement of text in the image; and comparing the produced data representing the arrangement of text to the stored version of the arrangement; determining whether the received image corresponds to the randomly selected page of the printed publication, and based on the determination that the received image corresponds to the randomly selected page, unlock the digital content.