Can I request HR to keep my salary private?

I recently had a background check done for a prospective new employer. I requested a copy of the background check and was surprised to see that my current job disclosed my salary (the report stated HR provided it). I really do not agree with this as I think this is private information. I do not want to sue or anything however I would like for them to not disclose it in the future.

Would a company usually respect a request such as this? I do not see a benefit for them to disclose my salary anyway. Do they have a legal obligation to not disclose my salary if I specifically state so in writing?