Free to use for your personal or commercial work, you don't need any permission.
29 Rock, Ground and Floor textures great for your designing work, great for 3d renders, amazing for game models.
All the textures comes with normal, displacement, specular maps.
The images those textures are based on are from taken from several free to use and share image, made tillable by me and backed normal, displacement, and specular maps.
I hope you like those textures and make great artwork