Cell phones, for instance, the major target of wiretapping, have their wireless signals encrypted by default.

FORBES: Encryption Can't Stop The Wiretapping Boom

One reason for the growth: They are among the few permissible "default options" in many retirement plans, so investors may have their savings in target-date funds without actively choosing them.

WSJ: 'Target' Funds Still Missing the Mark on Returns

Banks will seize such virtual assets in case of a default, or renegotiate the terms of a loan if a company misses a launch date, a sales target or an expected follow-on round of venture capital.

FORBES: Going Into Hock