Abstract: Unlocking digital content embodied in digital readable form on a digital media carrier includes receiving a scanned image of a page from scanning a physical copy of content, evaluating the scanned image; and if the scanned image corresponds to a selected page of the digital content, unlocking the digital content.

Abstract: A method executed on a server for unlocking digital content includes receiving a message corresponding to a request to access digital content embodied in digital readable form, associated with an electronic representation of a publication, sending a test that is based on the user having physical possession of the publication; receiving and evaluating an answer to the test to determine whether the correct answer was received; and if the answer was correct, providing access to the digital content associated with the electronic representation of the publication.

Abstract: A method executed on a server for unlocking digital content includes receiving a message corresponding to a request to access digital content embodied in digital readable form, associated with an electronic representation of a publication, sending a test that is based on the user having physical possession of the publication; receiving and evaluating an answer to the test to determine whether the correct answer was received; and if the answer was correct, providing access to the digital content associated with the electronic representation of the publication.

Abstract: Unlocking digital content embodied in digital readable form on a digital media carrier includes receiving a scanned image of a page from scanning a physical copy of content, evaluating the scanned image; and if the scanned image corresponds to a selected page of the digital content, unlocking the digital content.

Abstract: Unlocking digital content embodied in digital readable form includes generating a test based on the user having physical possession of a printed copy of the digital media, sending the test to the user requesting an answer to test, evaluating the answer supplied by the user; and if the test was answered correctly, unlocking the digital content.

Abstract: Unlocking digital content embodied in digital readable form on a digital media carrier is described. Unlocking the digital content includes evaluating a code provided by a user scanning a tag attached to a printed, physical copy of the digital content; and if the code corresponds to an authorized code, unlocking the digital content.

Abstract: Unlocking digital content embodied in digital readable form on a digital media carrier includes generating a test based on text that is printed in a physical copy of the digital content, prompting a user to input text that appears on a specific page of the physical copy, evaluating whether the user entered the correct word; and if the word was correct, unlocking the digital content.