Manufacturing a physical medium configured to store data and obtaining additional information associated with an article in a book

A computer program product, comprising a computer hardware readable storage device having a computer readable program code stored therein, said program code containing instructions configured to be executed by a processor of a computer system to implement a method for obtaining information associated with an article in a book, said method comprising:

• emitting light of a specific wavelength in a manner that directs the light onto invisible information written in the book in invisible ink, said specific wavelength of light interacting with the invisible ink to illuminate the invisible information to become visible, said emitting being performed by a light-emitting element of a cellular phone, said invisible information comprising a Universal Resource Locator (URL) of an address of a web server at which the additional information is located, said URL being encoded in a code within the invisible information;
• and
• taking a picture, by a digital camera comprised by the cellular phone, of the illuminated invisible information to capture an image of the code into the cellular phone;
• and
• storing the captured image in a memory of the cellular phone.