As per the Interim Final Rule issued by the TSA in TSA-2001-11120-1, The security service fee will apply to passengers using frequent flyer awards for air transportation, but may not be imposed on other nonrevenue passengers.
However, in TSA-2001-11120-11, the ruling was that non-revenue passengers WOULD be subject to the fee, but stayed the collection of that fee until the comment period was over on March 1. TSA-2001-11120-48 extended this comment period through July 31, but does not address whether the interim stay on fee collection would be lifted.
Until the time of the final ruling, the airlines are not collecting this from their nonrevs on ZERO REVENUE tickets, but are holding the $2.50/segment in escrow for the government in case the ruling goes that way. Other tickets with revenue, such as ID90s, yield fares, interline passes, buddy passes, etc.. are subject to the security collection at source.