A Dense Net

A magic book on an application?

How could it be publicly sold in a bookstore?

Donnie seemed able to hear his own heart beating intensely and crazily. As per the regulations of the Congress of Magic, other than exchanging for such knowledge in magic colleges and arcana libraries, there were only two ways to obtain the applications that exceeded their own levels—to gain it from adventures or family heritage, or to become a personal student of a certain sorcerer. There had never been a common bookstore that publicly sold magic books!

It was the Congress' control measure on magic to maintain the social order, which was greatly supported by the nobles.

"If… If I can analyze a first-circle spell in advance or become an official sorcerer, my future in the Heidler Magic College will be even brighter…" Donnie felt that his heart was jumping out of his chest.