You can never protect yourself 100%. What you do is protect your self as much as possible and mitigate risk to an acceptable degree. You can never remove all risk.
Kevin MitnickI get hired by companies to hack into their systems and break into their physical facilities to find security holes. Our success rate is 100%; we've always found a hole.
Kevin MitnickI obtained confidential information in the same way government employees did, and I did it all without even touching a computer. ... I was so successful with this line of attack that I rarely had to go towards a technical attack.
Kevin MitnickSo what I was essentially doing was, I compromised the confidentiality of their proprietary software to advance my agenda of becoming the best at breaking through the lock.
Kevin Mitnick