“Why did Microsoft choose not to use existing code? I cannot
say. The license allows them to use the existing code as is without
legal ramifications.“
“However, despite legal availability of the code, it was not
used and this allows Microsoft to open the floodgates. Since they
wrote their own code, they are not, nor ever were, bound to the
M.I.T. license. This means that even if the code had been released
under the GPL, Microsoft could have released a new version with
proprietary extensions without violating the M.I.T. license or
running afoul of the law.”
“So we are now left with Leibovitch’s article, which is clearly
designed only to attack BSD systems. Leibovitch states that
Microsoft’s treatment of Kerberos is an example of real harm to the
free software community that occurred because a BSD license was
used. But as we have already seen, the GPL could have not have
prevented it.”