Crafting a special kind of license for a very special standard.

[David Woolley]

John Cowan wrote:
  code.
> 
> In fact, Netscape (through version 4) and IE (through version 6) are
> independent reimplementations of the original NCSA Mosaic codebase.

The key point about web browsers is that they have to be bugwise
compatible; complying with the specification isn't enough.  That
means that they have to work the same as their competitor without
actually using the competitor's code.