Dual licensing was invented independently by several people in the 1980s, including the presenter of this talk. It is the basis of a 32-year-old successful business supporting the development of Ghostscript, Open Source software that is arguably the highest quality and most widely deployed independent implementation covering the all major PDLs (PostScript, PDF, PCL, XPS).
This talk will cover one of many possible maps of how to structure thinking about Open Source business; how Ghostscript does and doesn't align with that map; what has made Ghostscript successful; and a perspective on dual licensing in general.
