FILE PHOTO: A sign stands at Blackberry's Network Operating Centre (NOC) in Waterloo, Ontario, Canada, May 29, 2018. REUTERS/Mark Blinch/File Photo
Facebook Inc is suing BlackBerry Ltd for patent infringement, escalating the legal battle between the two companies over protected technology.
In a 118-page complaint filed Sept 4 in San Francisco federal court, Facebook accused BlackBerry of stealing its voice messaging technology, among other patented processes. Facebook is seeking unspecified damages.
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