What does “copyleft effect” for OXID eShop Community Edition mean?
OXID eShop Community Edition is licensed to you under the terms of GPL v3. If you decide to modify the code and distribute it to third parties, all modifications made will continue to be licensed under GPL v3 and all obligations will remain intact. However, because the OXID eShop source code is entirely written in PHP, you will not need to separately distribute the source code.