https://vibed.org/api/ and every page there I've looked at recently has the text
block ddox.authorsblock ddox.copyrightblock ddox.license
visible at the bottom, and blank Authors, Copyright, License. Seems there's diet-ng template bug. :) Here's the resulting HTML, pasted from Firefox modulo indentation.
<table class="license-info">
<tr>
<th>Authors</th>
<td:>block ddox.authors</td:>
</tr>
<tr>
<th>Copyright</th>
<td:>block ddox.copyright</td:>
</tr>
<tr>
<th>License</th>
<td:>block ddox.license</td:>
</tr>
</table>