Patrick Brunschwig <patr...@enigmail.net> wrote: > On 01/07/2020 03:40, Dmitry Alexandrov wrote: >> Patrick Brunschwig <patr...@enigmail.net> wrote: >>> Enigmail is available for: * Postbox (https://postbox-inc.com), a >>> commercial product >> >> Could you tell more about it, please? Itʼs nonfree, is not it? >> >>> currently based on TB 52. >> >> Yet, being a fork of Thunderbird, it should have a substantial free part. >> How large that part is? Is is published? Does it adds anything valuable on >> top of Thunderbird? >> > > The Mozilla Public License allows to create closed-source software without > the need to publish anything.
Sure. No free software license mandates that anything must published. > That is, there no published code. Neither you, being a purchaser of ‘Postbox’, have ever downloaded it? Indeed, MPLʼs copyleft is so weak, that a free code you get is not necessary any useful for an user¹, but I supposed, that you, being a prominent extension developer besides an end-user, might be interested in it nevertheless... - ¹ I. e. there may be no way to relink or rebuild an application against it. > Postbox adds quite a bit of functionality and design to the user interface. > Just have a look on their homepage. Sorry, I have to express myself more clearly — by ‘it’ I meant a free part.
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