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Robust in Computer & internet security category icons

Lock Padlock Secure Locked
closed, lock, locked, padlock, robust, secure
closed, lock, locked, padlock, robust, secure
lock, open, padlock, robust, unlocked, unsecure
iron, lock, padlock, robust, locked, secure, security
brass, lock, padlock, robust, protection, secure, security
closed, lock, locked, padlock, robust, secure
lock, open, padlock, robust, unlocked, unsecure
lock, open, padlock, robust, unlocked, unsecure
lock, open, padlock, robust, unlocked, unsecure
closed, lock, locked, padlock, robust, secure