Can i use vanilla textures?

Hi,
this might sounds dumb, but can I use vanilla textures?
The reason why am i asking is because i was checking rules for texturepacks, and then saw this one:

"Post packs that include original Minecraft content.
This is a breach of copyright, and not the way texture packs should be
compiled. They should only contain the changed or added files, which
allows them to be mixed and matched, and reduces the file size
significantly".

I understand that I have to remove things that i didn't edited or used because of the size of the file.
But can I use these textures without including them in file and not breaking the rules of copyright?
I wouldn't feel very well if i used someone's hard work in mine and not knowing about that.

If you have any idea, any reply would be appreciatted.