All reports of copyright-refers-to-versionless-license-file for the archive. The extended description of this tag is:
The copyright file refers to the versionless symlink in /usr/share/common-licenses for the full text of the GPL, LGPL, or GFDL license, but the package does not appear to allow distribution under later versions of the license. This symlink will change with each release of a new version of the license and may therefore point to a different version than the package is released under. debian/copyright should instead refers to the specific version of the license that the package references.
For example, if the package says something like "you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 dated June, 1991," the debian/copyright file should refer to /usr/share/common-licenses/GPL-2, not /GPL.
This tag has not been emitted in any package tested by Lintian.