关于开源免费试用权限的问题,provide credit 是什么意思?

Question

我在github上看到了个不错的UI Js 库,然后README中提到,该UI是基于http://materialmockups.com/这个设计的,于是我去下载了一份该网站的设计,然后里面有段文字如下,我英文不太好,但是看起来说好像是免费,然后试用的话必须提供credit 这是什么意思,翻译软件翻译过来是信誉.....这样我就不知道到底可不可以随便试用了,请英文好的帮我看看这到底可以随意试用吗?

CARBON - Material Wireframe Kit

We may use this Kit as you want, in personal or commercial projects!
You may not redistribute it thought and if you include it in freebies links, collections etc. you must provide credit.

Finally, if you want, you may follow me on Dribbble and Twitter!

Enjoy!

dribbble.com/iampanagiotis
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materialmockups.com