It's not a nag screen. It's informative and wants to make sure that you're aware of possible license issues.
Dear Xara request is summarized as follows:
The font substitution box should have checkboxes, "Don't show this to me again", and "Show this only once per session".
Just a note that communicating clearly and succintly makes it easier for the developers to see what you're talking about.
Thread summarized to make request clear.
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