There is an article in today’s WSJ titled “Is the Ivy League’s Admission Bias a Trade Secret?”
https://www.wsj.com/articles/is-the-ivy-leagues-admission-bias-a-trade-secret-1490740763
For those without access to the WSJ, the summary is that a person named Jian Li sued Princeton for racial discrimination in 2006. The Justice department exonerated Princeton in 2015. However, his supporter, Edward Blum of Students for Fair Admissions filed an FOIA request with Princeton. Princeton is refusing on the basis that its admissions policies are a ‘Trade Secret’.