The Solar System and World of Near game texts are licensed with the Creative Commons Attribution license. What this means in practice is that anybody can use the licensed materials pretty much any way they want, provided they attribute the source and act in good taste.
The text on this web site were originally written and edited by Eero Tuovinen, whose site is: http://www.arkenstonepublishing.net.
The idea and encouragement for doing this comes from Clinton R. Nixon, who licensed the original Shadow of Yesterday with the same license.