Lintian tag information: copyright-does-not-refer-to-common-license-file (type: warning)

Description (from lintian-explain-tags)

If your package uses any one of the licenses in
/usr/share/common-licenses, the copyright file should refer to files
therein.

Please refer to Copyright information (Section 12.5) in the Debian Policy
Manual for details.

Visibility: warning
Show-Always: no
Check: debian/copyright

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