A computer system which implements a method of manufacturing a physical medium configured to store data. The computer system includes a processor, a memory coupled to the processor, and a computer readable storage device coupled to the processor. The storage device contains program code which, upon being executed by the processor via the memory, implements the method. In accordance with the method, a layout design of visible information to be printed with visible ink in a book is generated, wherein the visible information including an article; and a layout design of invisible information to be printed with invisible ink in a book is generated, wherein the invisible information includes a Universal Resource Locator (URL) of an address of a web server at which additional information is located, the URL being encoded in a code within the invisible information, and the additional information being associated with the article.