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/usr/share/doc/libcommons-parent-java/copyright is in libcommons-parent-java 39-3.

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

The actual contents of the file can be viewed below.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Apache Commons Parent POM
Source: http://svn.apache.org/repos/asf/commons/proper/commons-parent/trunk/

Files: *
Copyright: 2006-2015, The Apache Software Foundation
License: Apache-2.0

Files: debian/*
Copyright: 2010, Ludovic Claude <ludovic.claude@laposte.net>
License: Apache-2.0

License: Apache-2.0
  On Debian GNU/Linux system you can find the complete text of the
  Apache-2.0 license in '/usr/share/common-licenses/Apache-2.0'