1. A method of retrieving content and meta-data associated with the content from at least one page of a printed document containing document content data and a first machine-readable encoding on one face of the at least one page, the method comprising: scanning the face of the at least one page of the printed document containing the document content data and the first machine-readable encoding; processing the scanned document data to extract document content; processing the scanned first machine-readable encoding to extract document meta-data, wherein the first machine-readable encoding encodes the location of a second machine-readable encoding on a second page containing document meta-data; and associating the extracted document meta-data with the extracted document content for the face of the at least one page of the printed document.