[License-discuss] step by step interpretation of common permissive licenses

[Massimo Zaniboni]

On 17/01/2017 15:31, Kevin Fleming wrote:

> In general 'permissive' vs. 'non-permissive' applies to the obligation
> to publish source code, not the obligation(s) to reproduce copyright and
> license notices.

Yes, but not only this. Copyleft licenses like GPL define *also* the 
license on which derived works must be released, so also derived works 
remain fee/modifiable, etc..

Apache/MIT/GPL specify explicitely how you can relicense derived works:
* in GPL you mus apply the same GPL license also to derived works
* in MIT/Apache you can freely relicense the derived work, until you 
cite/credit the original work

BSD and ISC do not specify if/how you can relicense, IMHO their text is 
not so clear.

Regards,
Massimo