Implications for switching licenses mid-stream

Jon Lesser jonlesser at
Tue Apr 22 19:35:11 UTC 2008

We have all of our code contributors on board, so thankfully that's  
not a problem.

All of your responses have been helpful. Thank you!


On Apr 22, 2008, at 8:45 AM, Ben Tilly wrote:

> On Mon, Apr 21, 2008 at 11:12 PM, Arnoud Engelfriet
> <arnoud at> wrote:
>> Jon Lesser wrote:
> [...]
>> And by the way, you need permission from all contributors to switch
>> to Y, but you probably knew that.
> Not always true!
> In the case of BSD to GPLv3 you don't need explicit permission from
> anyone because the BSD already grants sufficient provision.
> In the case of "GPLv2 or later" to GPLv3 you don't need permission for
> the same reason.
> In the case of GPLv2 to GPLv3 you do need some sort of permission.
> But from what I've read, you _may_ need less (at least in US law) than
> many have assumed.  See
> for further
> discussion.  I have no idea how that plays out internationally.  And
> you should talk with a lawyer before applying that theory to a
> specific project.
> Ben

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