18 U.S.C. § 2510(21) (Title 18—Chapter 119: Wire and Electronic Communications Interception and Interception of Oral Communications)
As used in this chapter [18 U.S.C. §§ 2510 et seq.]—
(21) "computer trespasser"—
(A) means a person who accesses a protected computer without authorization and thus has no reasonable expectation of privacy in any communication transmitted to, through, or from the protected computer; and
(B) does not include a person known by the owner or operator of the protected computer to have an existing contractual relationship with the owner or operator of the protected computer for access to all or part of the protected computer.