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Perhaps, it's worth checking for a license field like below, inside [the render() function](https://github.com/seboettg/citeproc-php/blob/0a5cce7744ce9c40a0343fbc34fd49f6fca2036e/src/Rendering/Text.php#L102-L113), and add the string extraction logic to a new function `renderLicense()`? The thing is, License is...