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/usr/share/doc/ax25-tools/copyright is in ax25-tools 0.0.10-rc4-1+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This package was debianized by Craig Small <csmall@debian.org> on
Fri,  4 Jun 1999 14:28:59 +1000.

Original source may me found at ax25.sf.net

Copyright 2003 Jonathan Naylor, Tomi Manninen, Jean-Paul ROUBELAT, Alan Cox

A copy of the GPL can be found in /usr/share/common-licenses/GPL