Where an unsecured creditor could not sue for an alleged antitrust violation committed by a vendor of bankruptcy software because it was not a participant in the relevant market.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Joan H. Lefkow.A Chapter 7 bankruptcy petition creates a bankruptcy estate, which becomes the temporary legal owner of the debtor’s property. The Executive Office of the U.S. Trustee appoints a trustee to administer the estate. The trustee collects and liquidates …