Here's my recollection of how Mosaic turned into Internet Explorer:
Microsoft licensed a customizable version of Mosaic from Spyglass, and marketed it as Internet Explorer. As part of their marketing strategy in the infamous browser wars, they decided to dump the browser on the market for free (you could actually purchase web browsers back then). Now Microsoft was supposed to pay Spyglass a fee on a per-copy-distributed basis, which would mean that MS would actually be paying for people to use their (now free) browser. But according to a Spyglass executive, MS failed to actually honor the agreement, by not actually bothering to pay.
Spyglass was vocal about suing Microsoft-- for about a week. Then, as suddenly as it had appeared, the story dropped. But I'm sure that there was not a pay-off-- I mean settlement-- involved.