Public Domain

License is not required to use a public domain work. Public domain
works are not protected by copyright. There is no owner for the works under public domain and it can be used by anyone for free.
When the copyright is expired it automatically goes under public domain.

Royalty free

The word Royalty Free does not mean that it is free to use.
The images or any work can be purchased as single image or work from the author and can be used as many times as you’d like, in as many ways as you’d like.
Certain Restrictions may apply also see the license agreement before you purchase from the author.

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