Wcopyright-contains-automatically-extracted-boilerplate
The tag is present in Lintian version 2.104.232. That is the most recent version we know about.
The string "This copyright info was automatically extracted" appears in the copyright file, which indicates that you either didn't check the whole source to find additional copyright/license, or that you didn't remove that paragraph after having done so.
Refer to Debian Policy Manual section 12.5 for details.
Visibility: warning
Check: debian/copyright