9. A non-transitory computer-readable storage medium whose contents, when executed by a mobile device, cause the mobile device to perform a method of enabling access to supplemental electronic materials associated with a document, the method comprising: capturing a human-readable text sequence of a print version of the document using an imaging component of the mobile device, wherein the human-readable text sequence includes text that is perceptible by a human on the print version of the document; processing data from the imaging component to recognize the text; identifying, within the human-readable text sequence of the print version of the document, a text fragment of the print version of the document; identifying the document based on the text fragment; identifying supplemental electronic materials associated with the document, the supplemental electronic materials being materials presentable using an audio or visual medium; determining that a request to access the supplemental electronic materials associated with the document is implicit in receiving the human-readable text sequence; retrieving a set of access rules for the supplemental electronic materials associated with the document; resolving the request by enabling access to the supplemental electronic materials when the request satisfies the access rules or denying access to the supplemental electronic materials when the request does not satisfy the access rules, wherein resolving the request by enabling access to the supplemental electronic materials when the request satisfies the access rules includes permitting access to the supplemental electronic materials when the human-readable text sequence includes an indication that the human-readable text sequence was captured from the print version of the document.
10. The non-transitory computer-readable storage medium of claim 9 , wherein resolving the request includes applying the access rules associated with the supplemental electronic materials to the received request.