What is the fine-grained topic of the following text: Obama’s appearance on Friday at the event known as SXSW, the first by a sitting president, comes as the FBI tries to force Apple Inc. to help investigators access an iPhone used by one of theassailants in December’s deadly San Bernardino, California, terror attack. Only return the topic.
Obama's appearance at SXSW amidst FBI-Apple San Bernardino case