How could licences be chosen to allow this?
As an example, how are things done with paid addons with Prestashop?
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Too broad - depends on the exact licenses involved. – curiousdannii Jun 9 '16 at 0:09
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@curiousdannii how could I make the question more specific? I know little about licenses. – James P. Jun 9 '16 at 1:31
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@JamesPoulson It would likely be helpful if you could perhaps give a scenario with various details of the situation. Otherwise, yes, it is a little broad. – Zizouz212 Jun 11 '16 at 19:32
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@Zizouz212 one scenario I am thinking of is the marketplace that Prestashop has as mentioned in the question. I don't know what licence they use for addons. addons.prestashop.com/en – James P. Jun 12 '16 at 8:24
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prestashop.com/forums/topic/398499-prestashop-module-licensing – James P. Jun 12 '16 at 8:25
According to the GNU Licenses FAQ here and I quote
However, in many cases you can distribute the GPL-covered software alongside your proprietary system. To do this validly, you must make sure that the free and non-free programs communicate at arms length, that they are not combined in a way that would make them effectively a single program.
So I think you can combine it with proprietary as long as it's in an arms length.
For eg, Plugins/Add-ons, but make sure the core working of your program is not completely depended on that plugin.
Some Open source licenses such as MIT or BSD does allow you to sub-licensing.
Again it depends on what license is used.
Disclaimer: I'm just a programmer, not a laywer.
