A debate about the damages available to some to 4.2 million customers of the Hannaford Brothers Co. supermarket company whose financial information was compromised during a data breach dominated an oral argument at the 1st U.S. Circuit Court of Appeals.

The Sept. 8 hearing in Anderson v. Hannaford Brothers Co. concerned the appeal of a May 2009 order by District of Maine Judge D. Brock Hornby that rejected most of the plaintiffs’ claims.