FROM CGTEXTURES.COM
May I put some of your textures on my own website?
Redistribution of the textures is not allowed. Please keep the textures in one place (this site). That way everybody knows where they came from and what the license terms are.

and:

You say mass-downloading is not allowed: What do you mean by mass-downloading?
That's when you try to download the whole website to your computer, including thumbnails and html files. Attempting to download this many pages would use up a lot of bandwidth and would make the site slower for everyone else. Anybody trying to mass-download will have his/her IP banned automatically.