13. The non-transitory computer readable medium of claim 12 , wherein the text captured by the capture device comprises a reference to the first product and a reference to a second product, and wherein providing the purchase option to purchase the product comprises: assessing availability of each of the referenced products for purchase, wherein the first product is assessed to be available and the second product is assessed to be unavailable, and providing an opportunity to purchase the first product without providing an opportunity to purchase the second product.
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.