Thank you.

It would seem that the Mayang textures are free for all uses.
There is a limited redistribution policy.
reference source:
Mayang textures
License
These textures are Copyright © Mayang Murni Adnin, 2001-2006. They have all been taken by our own cameras or created by ourselves.
Use:
They are free to use for all uses, whether commercial or non-commercial (you may incorporate them into your work with no requirement to pay us any licensing fee etc). It would be nice if you could credit us.
Sell:
You may not sell any of these textures.
Redistribute:
You may redistribute (give/send to somebody else/display on a web site) up to 30 of these textures together, but no more. You must credit this website as the original source (tell them about us).

It might be rather difficult to know the restrictions for textures from unknown sources.