I have many questions and do not really know where to start

[Ben Tilly]

On Mon, Aug 25, 2008 at 5:32 AM, Matthew Flaschen
<matthew.flaschen at gatech.edu> wrote:
> John Cowan wrote:
>> Yes, although it may be problematic to retract the rights of people who
>> are already acting on the license.
>
> Also note that changing the license will be difficult if you have
> incorporated modifications from other copyright holders.

That is not true if you're moving from a permissive license (like the
MIT) to the GPL.  It is true if you're moving from the GPL to a
permissive license.

Cheers,
Ben