"We deeply regret that this incident occurred," Chief Security Officer
The software company, known for its Photoshop graphics editing program, Acrobat PDF document readers and other programs, also said source code for numerous Adobe products was stolen in a separate but related intrusion.
Products whose source code was stolen include the Acrobat family of products, the ColdFusion Web application platform, ColdFusion Builder and unspecified other Adobe products, the
"Based on our findings to date, we are not aware of any specific increased risk to customers as a result of this incident," Adobe said.
"Effectively, this breach may have opened a gateway for a new generation of viruses, malware and exploits," he wrote in a blog post.
Adobe -- which said the "sophisticated attacks" were carried out "very recently" -- said the 2.9 million customers' stolen information included their names, encrypted information about their credit or debit cards, the cards' expiration dates and "other information about customer orders."
The company said it reset affected customers' passwords and contacted them by email with instructions about changing the passwords again.
Adobe also recommended those users change their passwords for other websites since the passwords, which they might use elsewhere, were now known to the hackers.
Adobe added it would send information showing customers how to guard against credit-card fraud.
The company offered those customers a complimentary one-year credit-monitoring membership.
In addition, Adobe said it notified banks about the attacks so they can help protect customer accounts.
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