With a potential fraud conviction in his future, Paul Ceglia is digging into the past to fight criminal charges that he fabricated a contract and other evidence in his failed suit claiming to own 50 percent of Facebook Inc.

Ceglia, who is facing a November jury trial, is seeking volumes of evidence from Facebook, including many of Mark Zuckerberg’s emails from his undergraduate years. According to a brief filed on Monday by the Southern District U.S. Attorney’s office, Ceglia has asked the court to issue subpoenas to both Facebook and Harvard University for electronic and hard copy records.