This is the Debian GNU/Linux version of the Tangram Perl module.

From Tangram.pod:

LICENSE & WARRANTY

    You may use Tangram, free of charge, under the terms of the GPL.
    You can obtain a commercial license from Sound Object Logic, see
    http://www.soundobjectlogic.com/tangram/licenses.html.

AUTHORS

    Except where noted, all the code and documentation was written by
    Jean-Louis Leroy (jll@soundobjectlogic.com) and Sound Object
    Logic.

The full text of the GPL is available on Debian systems in
/usr/share/common-licenses/GPL

This package has been through multiple maintainers (for a list see
/usr/share/doc/libtangram-perl/changelog.Debian.gz).

Current Debian specific changes are copyright (c) 2001-2002,
Stephen Zander <gibreel@debian.org>
