Lintian tag information: extra-license-file (type: information)

Description (from lintian-explain-tags)

All license information should be collected in the debian/copyright file.
This usually makes it unnecessary for the package to install this
information in other places as well.

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

Visibility: info
Show-Always: no
Check: files/licenses

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