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String::Copyright - Representation of text-based copyright statements


Version 0.003014


    use String::Copyright;

    my $copyright = copyright(<<'END');
    copr. © 1999,2000 Foo Barbaz <fb@acme.corp> and Acme Corp.
    Copyright (c) 2001,2004 Foo (work address) <foo@zorg.corp>
    Copyright 2003, Foo B. and friends
    © 2000, 2002 Foo Barbaz <foo@bar.baz>

    print $copyright;

    # Copyright 1999-2000 Foo Barbaz <> and Acme Corp.
    # Copyright 2000, 2002 Foo Barbaz and Acme Corp.
    # Copyright 2001, 2004 Foo (work address) <>
    # Copyright 2003 Foo B. and friends


String::Copyright identifies copyright statements in a string and serializes them in a normalized format.


Options can be set as an argument to the 'use' statement.

threshold, threshold_before, threshold_after

    use String::Copyright { threshold_after => 5 };

Stop parsing after this many lines without copyright information, before or after having found any copyright information at all. threshold sets both threshold_before and threshold_after.

By default unset: All lines are parsed.

format( \&sub )

    use String::Copyright { format => \&GNU_style } };

    sub GNU_style {
        my ( $years, $owners ) = @_;

        return 'Copyright (C) ' . join '  ', $years || '', $owners || '';


Exports one function: copyright. This module uses Exporter::Tiny to export functions, which allows for flexible import options; see the Exporter::Tiny documentation for details.



String::Copyright operates on strings, not bytes. Data encoded as UTF-8, Latin1 or other formats need to be decoded to strings before use.

Only ASCII characters and © (copyright sign) are directly processed.

If copyright sign is not detected or accents or multi-byte characters display wrong, then most likely the data was not decoded into a string.

If ranges or lists of years are not tidied, then maybe it contained non-ASCII whitespace or digits.


Jonas Smedegaard <>


This program is based on the script "licensecheck" from the KDE SDK, originally introduced by Stefan Westerfeld <>.

  Copyright © 2007, 2008 Adam D. Barratt

  Copyright © 2005-2012, 2016, 2018, 2020-2021 Jonas Smedegaard

  Copyright © 2018, 2020-2021 Purism SPC

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see <>.