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The description on its file description page there is shown below.
If you have the copyright of an image (for example, you photographed or created the image) and you wish for Wikipedia and/or its sister projects to use it in their articles, you need to to release it under a free license, such as the GNU Free Documentation License or the Creative CommonsAttribution or Attribution-ShareAlike licenses, which permit the usage, modification, and redistribution of your work for any purpose, including commercial purposes.
Do not use this tool to upload images which were created by someone else that you found on the internet.
The vast majority of images found on the internet are not acceptable for usage in other Wiki projects. You may only upload an image if you are the copyright owner.
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This file is (or includes) one or more of the official logos or designs used by the Wikimedia Foundation or by one of its projects. Use of the Wikimedia logos and trademarks is subject to the Wikimedia trademark policy and visual identity guidelines, and may require permission.
This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required.See Commons:Licensing.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Actualizando conforme a nuevo logotipo del proyecto Wikipedia / Cambios en mensajes - Motivo: actualización de toda la documentación y ayuda de edición en es:Wikipedia