What is this second degree price discrimination and also about the area talking about it?

FIGURE 13.23 Second-Degree Price Discrimination with Two-Part Tariffs The monopolist offers a budget membership package and allows users up to Q*1 of court time. Each hour is charged at price P\". The membership fee is equal to area EFG. If the professor chooses this package then he gets consumer surplus equal to area FGHI. The monopolist can offer an executive package that allows unlimited use and has membership fee equal to area EFG plus FJI