Legal side of add-ons

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If I wanted to write an add-on like this one:https://www.concrete5.org/marketplace/addons/superfish/... but for Concrete 5.7 am I allowed to use any of the core code and extend it?

What I mean, is that the add-on is basically the auto-nav with a different template applied to it. Do I have to rewrite the auto-nav code or can I use that as a base for the add-on?

The add-on would be developed to be sold in the Marketplace so needs to abide by the rules.

Dex

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nebuleu replied on at Permalink Reply
nebuleu
concrete5 use the MIT license.
http://www.concrete5.org/help/legal/concrete5_mit/...

In short, yes you can use any parts of the code, but you have to keep the copyright notice of the holder.

More about the MIT License on wikipedia:
https://en.wikipedia.org/wiki/MIT_License...