All reports of unknown-copyright-format-uri for the archive. The extended description of this tag is:
The copyright file appears to intended as machine-readable, but Lintian cannot recognize its format URI. It could be a typo for a common URI or a syntax error in the first paragraph. Please file a bug against Lintian if you believe that the copyright file in syntactically valid and the URI is correct.
Severity: pedantic, Certainty: wild-guess
Check: debian/copyright, Type: source, binary
This tag has not been emitted in any package tested by Lintian.