In light of the PRISM spying by NSA, German experts earlier warned their Government against using Microsoft Windows 8 by companies and authorities. And once again a German data-protection specialist Johannes Caspar warns against using iPhone 5S's new Fingerprint ID function. While Apple claims this to be secure by saying 'your fingerprint is only stored on the iPhone, never transmitted over the network' the expert arguments that 'The biometric features of your body, like your fingerprints, cannot be erased or deleted and stay with you until the end of your life without changing. They are crucial and should not be used for something as non-vital or casual as unlocking your device.