The documents, part of a trove believed to have been leaked by Russians, detail the Jewish billionaire's support for advancing the rights of Arab Israelis.
Dareen Tatour, a Palestinian citizen of Israel, has been under house arrest since October for Facebook postings and a poem posted on YouTube that alludes to joining martyrs.
Writers protesting Israel's sponsorship of a literary festival include Pulitzer Prize winners Junot Díaz, Richard Ford and Alice Walker, and award-winning author Louise Erdrich.