Inconsistent license statements

[stefan6419846]

As for the Python 2 version (https://pypi.org/project/IPTCInfo/), this package seems to have some misleading license statements.

The original Perl module states (https://metacpan.org/dist/Image-IPTCInfo/source/IPTCInfo.pm):

This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

According to https://dev.perl.org/licenses/, this most likely means GPL-1.0-or-later OR Artistic-1.0. This is what the trove classifiers state as well.

For IPTCInfo, the actual Python file header states:

This program is free software; you can redistribute it and/or modify
it under the same terms as Python itself.

This would map to Python-2.0 and is mirrored by ipcinfo3 as well:

iptcinfo3/iptcinfo3.py

Lines 13 to 14 in dfbfd90

	# This program is free software; you can redistribute it and/or modify
	# it under the same terms as Python itself.

At the same time,

iptcinfo3/setup.py

Line 58 in dfbfd90

license='http://www.opensource.org/licenses/gpl-license.php',

states that some GPL (without clear version) is correct.

What is the correct license here?