Dual Blade CS mastery book and event SP resets

So in a nutshell, I wish to re-do my Dual Blade skills using the SP reset coming in the future Legend patch. But I have bought mastery books from the Cash Shop, which give +1 to the skill used on.

Would I still keep those points after using the SP reset? Anyone has had experiene with these using previous SP reset events on Dual Blades?

Yes, you keep the extra points, however, they are still restricted as they were, meaning you can only use the extra SP from the slash storm, tornado spin, mirror image, and flying assaulter books on skills prior to 4th job (4 extra SP for 1st to 3rd+), and the extra SP from thorns and blade fury can be applied to all jobs (2 extra SP for 1st to 4th).

Exactly the answer I was looking for, thanks =)