This file is indexed.

/usr/share/doc/libcommons-lang3-java/copyright is in libcommons-lang3-java 3.4-1.

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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 Lang
Upstream-Contact: Apache Commons Developers <dev@commons.apache.org>
Source: http://commons.apache.org/lang/

Files: *
Copyright: 2001-2015, The Apache Software Foundation
License: Apache-2.0

Files: debian/*
Copyright: 2011, Damien Raude-Morvan <drazzib@debian.org>
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'