1. A method of processing a paper document, the method comprising: receiving an identification code associated with an identification tag; determining, from a first database storing information associated with a plurality of feature descriptors, electronic information to be associated with the identification code, the determining comprising: obtaining an electronic representation of contents printed on a first paper document; selecting a portion of the obtained electronic representation; locating one or more zones on the selected portion; determining a first feature descriptor based upon at least one zone of the one or more zones on the selected portion, the first feature descriptor being distinct from the identification code; determining a matching feature descriptor from the first database that matches the first feature descriptor; and determining, from the first database, electronic document information associated with the matching feature descriptor; and storing the identification code and the electronic document information associated with the matching feature descriptor in memory, whereby the electronic document information associated with the matching feature descriptor is associated with the identification code and is determinable using the identification code.