The company also said hackers had stolen part of the source code to Photoshop-editing software that is used by professional photographers.
Adobe said the attackers took credit card information and other data from customers' accounts.
The hackers also accessed Adobe IDs and encrypted passwords that were stored in a separate database.
The software maker said the attackers stole the source code to three other products: Acrobat, ColdFusion and ColdFusion Builder.
The investigation was continuing, she said.
"It will take some time to complete." - Reuters
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