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Thank you for using my plugin and for your kind words!
To address your question: All WordPress plugins, unless specified otherwise, are distributed under the GPL license. This means you are free to modify the code to your liking. However, you should be cautious about plugin updates. Future updates may overwrite your custom modifications, so you’ll need to manage these changes accordingly.
I’m actually open to user-proposed modifications, as they can significantly improve the plugin. If you could share your specific needs with me, I might be able to assist by incorporating a hook into the plugin itself. This would allow you to achieve your desired outcome without risking loss of your modifications during updates.