Joining forces vs. starting from scratch (was Re: Proposal to start a new implementation...)

Magnus Melin mkmelin+mozilla at
Wed Apr 12 07:38:47 UTC 2017

On 12.4.2017 02:06, Óvári wrote:
> Why did R Kent James demand CardBook
> <> be licensed under MPL
> then? Zero win for CardBook...

Depends on the perspective and your goals for your code. Being license 
compatible to core code makes it possible to include it in core. In parts or 
as a whole. If inclusion of some sort is the goal, the license needs to be 

> LibreOffice <> seems to be working, why not copy
> their licensing model?

They are actually using the MPLv2, like Thunderbird.

As I see it the problem with MPL is that you don't have to provide your whole 
derivative work as open source. Only the actual changes, which makes porting a 
feature extremely impractical as the changes can rely on other code which you 
don't have to provide.


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