All of the free icons that are offered for download on this website, DownloadFreeSVGIcons.com, are released under Creative Commons CC0. This means that you can download, copy, modify, distribute and use the icons for personal and commercial purposes without having to ask for permission and without giving credit back to us. However, some icons may be protected by trademarks. You also can not use any of the icons for any illegal purposes or for sexually explicit material.
Although I don't require credit of any kind, I'd be happy if you did link back to my site, maybe from a resource page for example, to show your appreciation and also so that I can continue to provide you with free icons without any restriction of any kind.