"In cases where we have information and they've gone through the lawful process we don't just pass it over, but we do it very, very promptly," he said.

Encryption

Information generated and stored on an iPhone is encrypted, meaning Apple cannot access items such as iMessages or iCloud backups, however, Cook explained metadata is accessible. 

"Encryption doesn't mean there's no information," said Cook. "Because metadata probably exists and metadata, if you're putting together a profile, is very important." 

This information includes who an iPhone user has called and when. 

"The reality is that cyber attacks on people and governments, these affect your safety and security," he added.

Apple fought a high-profile case against the FBI last year in relation to the iPhone of the San Bernardino gunman. The FBI had requested that Apple create a loophole to allow them access information stored on the phone. Apple resisted, citing user privacy and security as a top priority. The FBI managed to access the phone after an unknown source came forward with a solution.