Blackboard also filed a cease and desist order this week, calling for Hoffman and Griffith to remove the Blackboard logo from their websites and cease from disclosing any information about the system or the card readers.
The order came after the two hackers announced their plans to disclose their findings at the InterzOne II conference held in Georgia last weekend.
Gregory Smith, an attorney representing Blackboard, said that Hoffman and Griffith have complied with the cease and desist order and have agreed to an extension of those restrictions for another 45 days.
Hoffman and Griffith could not be reached for comment.
Harvard installed Blackboard’s system in 1994 when it created the Crimson Cash program.
—Staff writer Kimberly A. Kicenuik can be reached kicenuik@fas.harvard.edu.