I. Melissa Harris, reporter for the Baltimore Sun, explains in her Oct. 20, 2006 article "Former Delegate Gets Purported Diebold Code":

"Diebold Election Systems, Inc. expressed alarm and state election officials contacted the FBI yesterday after a former legislator received an anonymous package containing what appears to be the computer code that ran Maryland's 2004 polls...

The availability of the code - the written instructions that tell the machines what to do - is important because some computer scientists worry that the machines are vulnerable to malicious and virtually undetectable vote-switching software. An examination of the instructions would enable technology experts to identify flaws, but Diebold says the code is proprietary and does not allow public scrutiny of it...

Diebold has not confirmed that the code received by [Cheryl C.] Kagan is authentic, said Mike Morrill, a spokesman for the company in Maryland. But Johns Hopkins University computer scientists Aviel Rubin reviewed one of the disks and said he believed it was genuine...

Kagan called the attorney general's office, and word of the disks began to spread. Learning of the development, Linda H. Lamone, the state's elections chief, reported Kagan's possession of the code to the FBI yesterday. Kagan said she had been contacted by an FBI investigator but had not met with him. 'I intend to cooperate' with the inquiry, Kagan said, adding that she believed evidence of a serious security breach had to be revealed. An FBI spokeswoman could not confirm yesterday the nature of the bureau's interest...

The codes, which were delivered to Kagan in three versions on separate disks... appear to be created by two companies that test the software - Wyle Laboratories and Ciber Inc., whose teams are based in Huntsville, Alabama. Maryland law requires such independent testing before the equipment's use. The disks have the testing authorities' names on them, as well as other identifying features. Anyone who had permission to to handle these disks would have received passwords from Diebold, enabling investigators to trace those authorized to use them."
Oct. 20, 2006 Melissa Harris