Apple last week made an important privacy statement and told customers that it values their privacy and it further wants to help them secure personal data including messages, calls and photos by encrypting them. Similarly, Google plans to turn on personal data encryption by default in Android L to further guard user data. On top of these default practices available in iOS 8 and coming to future Android devices, The Associated Press has highlighted other means that can help iOS and Android users (at least on some devices) to protect their photos, at least temporarily.
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