Modifying the concrete5 commercial licence

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Hi!

We're about to publish few commercial add-ons to the marketplace pretty soon and are now looking for licence terms suitable for us.

In the add-on submission guidelines you state the following:
"...feel free to modify our commercial add on license to match your location and make it easy for everyone!"

I would just like to ask if it is possible to do ANY changes we want to the licence or just to modify the "location" as you state on the guidelines? We feel the licence terms are pretty fair for both sides (vendor and purchaser) but we might want to modify few things in it. Is this possible?

Best regards,
Antti

Mainio