The new Amazon Fire tablet is displayed during a media event introducing new Amazon products in San Francisco, California September 16, 2015. REUTERS/Beck Diefenbach

(Reuters) - Amazon.com Inc AMZN.O said it plans to restore an encryption feature on its Fire tablets after customers and privacy advocates criticized the company for quietly removing the security option when it released its latest operating system.

“We will return the option for full-disk encryption with a Fire OS update coming this spring,” company spokeswoman Robin Handaly told Reuters via email on Saturday.

Amazon’s decision to drop encryption from the Fire operating system came to light late this week. The company said it had removed the feature in a version of its Fire OS that began shipping in the fall because few customers used it.

On-device encryption scrambles data so that the device can be accessed only if the user enters the correct password. Well-known cryptologist Bruce Schneier called Amazon’s removal of the feature “stupid” and was among many who publicly urged the company to restore it.

Apple Inc's APPL.O legal battle over U.S. government demands that the iPhone maker help unlock an encrypted phone used by San Bernardino shooter Rizwan Farook has created unprecedented attention on encryption.

Amazon.com this week signed on to a court brief urging a federal judge to side with Apple.