[Q] Root without unlock or touch anything topic

Hi, i need a way to get only root access, without unlock, with all stock and avaiable ota, there is a way to do this?
I did it with my tf300t with one-click-transformer-root, and i did same thing with my note 2 lte with framaroot and ota rootkeeper.
I need a way to not lose warranty, and have just root access.
Thank's in advice for answers!