third party? license?

Does this require third party server connectivity?
Or are all the voices included in the plugin to run off of our server?

Your site says non-commercial license, and removing branding violates agreements – not sure how this can be gpl of that is a requirement(?)

Neat idea – but I think the privacy implications may be a serious issue. (depending if this needs to connect to third party servers or not – assuming it does.)

https://wordpress.org/plugins/responsivevoice-text-to-speech/