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Function: _error_handler

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Function: require_once

Customization

Does the Extended License allow me to create an app or service that generates customized versions of the file for users? Or can I sell multiple customizations of an item under an Extended License?

No. The Extended License only allows for a single end product. By allowing your users to download their own customized versions, you're allowing the item to be used in multiple end products. You could purchase a single license for each user that picks that template.