When can licenses be revoked? (was: License Proliferation)

[Alex Bligh]

--On 06 September 2005 22:36 -0700 Ben Tilly <btilly at gmail.com> wrote:

> I didn't know, but it was my impression that it couldn't happen.
> However when I googled for the topic, I found nothing saying that it
> couldn't happen, and http://www.ilaw.com.au/public/licencearticle.html
> saying that it definitely could.
>
> Is this really true?  And if so, does anyone have any thoughts on why
> it isn't more often discussed?

I thought only licenses given without consideration were revocable
at will - most licenses open-source include obligations upon the licensee
and are thus not without consideration, and so cannot be revoked at
will (unless, of course, that is an explicit term in the license).

Alex