I wonder how did they take Mosaic from NCSA to found the business (later to be renamed to Netscape)? Did they really reimplement the browser, or maybe they had rights?
A number of companies licensed the rights to that code (it's in their credits as "Spyglass, Inc."). I just assumed that Netscape had a relationship with NCSA, but the browser that kept the "Spyglass, Inc." credit longest was actually IE, as far as I know.
If you want to know all the intrinsic little details on Mosaic, NCSA and Netscape I would recommend the book Weaving the Web. It is written by Sir Tim Berners-Lee back in 1999 and is very close on the action.
MCOM (later Netscape) and NCSA were definitely not on friendly terms. There was a lawsuit against MCOM at which point they changed their name.