pldebugger license: Artistic 1.0 or 2.0?

Hi,

the Debian ftp masters pointed out that the pldebugger license is
ambiguous: The source code states this:

Licence
-------

The pl/pgsql debugger API is released under the Artistic Licence.

    http://www.opensource.org/licenses/artistic-license.php

Copyright (c) 2004-2017 EnterpriseDB Corporation. All Rights Reserved.

... but the link to opensource.org (now) points to a disambiguation
page to choose between version 1.0 and 2.0 of the license.

Could you clarify which of the two you want there? (Or maybe a
combination like "1.0, or any later version".)

Thanks,
Christoph