Some Web sites will not be sold, but will allow us to put the credit of the agent and the credit is considered an honor, the owner works. Because the vast majority of images that put a credit, it is free to use.
Some sites do not sell But it does give us your own credit instead. Enter the credit and honor to be considered a contribution. Most of the images because it will provide free credit supply.
Some websites can not sell, but we put the credit instead. And put the credit to the considered an honour the work. Because most images that put the credit it to use for free.