The Pervasive Displays library suite comes in three editions:
The basic edition support global update for all screens and fast update for the E2271PS09 screen. It provides all the functions for shapes and text. It is shared under Creative Commons - Attribution ShareAlike NonCommercial. It is a set of standard Arduino libraries.
The advanced edition support global update for all screens, and fast update and partial update for monochrome screens. It includes the fixed Mono font and the proportional Serif and Sans Serif fonts; application libraries like graphics, GUI and bar- and QR-code. It comes as pre-compiled libraries for non-commercial usage. It is a set of pre-compiled Arduino libraries.
The commercial edition adds to the commercial edition the use of external SPI SRAM memory for the frame-buffer and external SPI Flash memory for the fonts. It provides the source code for commercial usage. It is a set of standard Arduino libraries.