Using Concrete5 Core Code for my add-on

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Is it permissible to use Concrete5 Core Code for my add-on, in particular I would like to "extend" the image block and would like to use most of the block's code for my package.

 
Mnkras replied on at Permalink Reply
Mnkras
Yes it is.

concrete5's core is licensed under the MIT License.

basically, you can do anything you want as long as there is attribution.