Defendant convicted of sex crime who was not in custody, probation or parole could not challenge requirement he register as a sex offender through post-conviction proceedings. State v. York, S-08-884, 278 Neb. 306 Defendant claims that this requirement renders him "in custody under sentence" such that he should be permitted to seek relief under the Nebraska Postconviction Act. See § 29-3001. We conclude that an individual who is subject to the registration requirements under the SORA (Neb. Rev. Stat. § 29-4001 et seq. (Reissue 2008)) is not "in custody under sentence" for purposes of the Nebraska Postconviction Act. See § 29-3001.