I'm pretty sure that in the last thirty years or more, or at least since the era of branding began, candidates with any negativity have restricted access and for good reason. We should be focusing on positive things not negative things when selecting candidates.
Can you cite another Presidential nominee who took similar precautions?
What precautions?
Every Presidents- and every Americans records are protected by the same laws.
Birth certificates are protected by state laws, college records by Federal laws.