Hello Fan,
The letter is confusing to me. Why do they use the word "currently?" Does that mean that you have to give them written permission or sign a margin or similar agreeement to lend out your shares, does it mean that you have only a cash account that prohibits the lending of your shares, does it mean that you once had a margin account that did give them the authority to lend in the past, or what?
Sound like you're safe for the moment, at least. If it's a non-US bank, perhaps they have the rules for lending shares on their website.