However, in response to new pressure from the industry following ABC News' report, Onity's previous hard line with hotels may be softening.
In a statement released Sunday to ABC News, the parent company of the Holiday Inn group of hotels, IHG, told ABC, "Confidential negotiations are underway between Onity and the industry regarding costs for any firmware upgrades required."
IHG also said, "It has been reported that Onity has an installed customer base of about 4 million locks at thousands of hotels worldwide. Onity has notified the hotel industry that solutions to the problem are available."
IHG told ABC News the Holiday Inn Express in Times Square that we visited has now placed an order with Onity for the products that will help them address the problem at that location.
"The Holiday Inn Express New York City Times Square is awaiting delivery of Onity's solutions for their hotel's locks; and both the hotel's management and IHG have contacted Onity regarding distribution to this specific hotel," the statement said.
Corporatewide, IHG said, "We have advised our hotels to work directly with Onity to monitor, and expedite if possible, delivery of their lock solutions."
A spokesperson for Hilton Worldwide said, "The safety and security of our guests is always our highest priority, and we are working with Onity to investigate and address this issue."
Security experts say it is important for guests who are concerned about safety to increase their use of in room safes, deadbolts and chains.
ABC News is continuing to follow this story as it develops. If you have a related tip that can help us, please email Mark.P.Greenblatt@abc.com.