16. The non-transitory computer readable medium of claim 12 , wherein the first product is purchased from a seller, and wherein the operations further comprise collecting a referral fee from the seller in connection with the purchase.
12. A non-transitory computer readable medium containing computer executable instructions that, when executed by one or more servers, cause the one or more servers to perform operations comprising: receiving text captured by a capture device from a paper form of a published document, the document having a publisher; identifying the published document and the publisher from the captured text; retrieving from a repository of digital documents, a digital form of the published document; identifying a first product, the first product being related to the captured text or to the digital document; providing to the capture device a purchase option to purchase the first product from a seller server; receiving a request to purchase the first product from the capture device and providing the request to the seller server; receiving a purchase notice confirming the purchase from the seller server; associating the purchase with the document and publisher; providing confirmation of the purchase to the capture device; and providing a purchase and source notice to the publisher, enabling the publisher or an author of the document to obtain compensation for the purchase.