It was previously considered to be in the public domain because it is a scan (or similar) by the Bibliotheque Nationale de France, but not everything scanned by the BNF is automatically in the public domain.
It is possible that this file is in the public domain for other reasons, for example because it was published a long time ago (anything before ca. 1900 is most likely ok) or because its author / artist / photographer died over 70 years ago and it was published over 95 years ago. In such cases, a new rationale should be applied, and a different license tag (see Commons:Licensing and valid license tags at Commons:Copyright tags) should be used.
If the file is not found to be in the public domain, it might be nominated for deletion (NOT by any automatic process, but manually).
See below for the previous rationale (not applicable anymore).
Previous public domain rationale, no longer applicable
Public domain works must be out of copyright in both the country of origin and the United States, and must be accompanied one or more valid copyright tags to indicate its status. Absence of such tags may result in a file's deletion.
This work is based on a work in the public domain. It has been digitally enhanced and/or modified. This derivative work has been (or is hereby) released into the public domain by its author, jebulon. This applies worldwide.
In some countries this may not be legally possible; if so:
jebulon grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Dieses Bild wurde digital nachbearbeitet. Folgende Änderungen wurden vorgenommen: Crop, size. Cleaning of dust, dirt, spots tears and scratches due to age. Correction of levels (saturation, contrast). With GIMP.
Lizenz
Ich, der Urheber dieses Werkes, veröffentliche es unter der folgenden Lizenz:
Die Person, die das Werk mit diesem Dokument verbunden hat, übergibt dieses weltweit der Gemeinfreiheit, indem sie alle Urheberrechte und damit verbundenen weiteren Rechte – im Rahmen der jeweils geltenden gesetzlichen Bestimmungen – aufgibt. Das Werk kann – selbst für kommerzielle Zwecke – kopiert, modifiziert und weiterverteilt werden, ohne hierfür um Erlaubnis bitten zu müssen.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse