The Android mobile operating system began with the release of the Android alpha in November 2007. The first commercial version,Android 1.0, was released in September 2008.
Oracle is accusing Google of using its Java software without paying for it to develop Android.
Google said in a court filing on Wednesday that the Android disclosures should not have been made public, and asked the court to place it under seal.
The document, which had been available electronically at a San Francisco courthouse, was removed from the publicly accessible portion of the court’s computer system while a Reuters reporter was reviewing it on Thursday afternoon.
It is not clear what occurred or whether the document would become available again.
Google was not immediately available for comment. Oracledeclined to comment.
The closely watched case involves how much copyright protection should extend to the Java programming language, which Google used to design the operating system. Oracle is seeking royalties for Google’s use of some of the Java language, while Google argues it should be able to use Java without paying a fee
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