Public Domain

The media that is marked with Public Domain license on is released under Creative Commons CC0. To the extent possible under law, uploaders of have waived all copyright and related or neighboring rights to the media marked with the "Public Domain" license. As a result of this you are free to copy, modify, distribute the media even for commercial purposes without attributing the original author or source

Some limitations though:

1. Any media depicting identifiable persons cannot be used for pornographic, unlawful or other immoral purposes. Also you can't use them in a way that can give a bad name to people or to imply endorsement of products and services by those persons, brands, organisations, etc.

b) Because media marked with the Public Domain license does not require or have a written Model Release for each media file that shows identifiable people, the operators of cannot guarantee that You will be able to use the Content for any purpose You like. Even if there is a Model Release, we do not make warranties whatsoever as to the legality or validity of it.

c) Certain media files may be subject to additional copyrights, trademarks, property rights and may require the consent of a third party or the license of these rights. It's your sole responsibility to make sure that You have all the necessary rights, consents and licenses for the use of the Content.

So the conclusion is that You use the media files at your own risk.