State-by-state guide:

New Hampshire

N.H. Rev. Stat. Ann. § 169-B:34 (1999): Juvenile proceedings are closed to the public. Further, any person who knowingly discloses confidential information shall be guilty of a misdemeanor.

N.H. Rev. Stat. Ann. § 169-B:35 (1999): The public is not allowed access to court records, unless pursuant to a court order or with written consent of the juvenile. Once a delinquent reaches 21 years of age, all court records and individual institutional records, including police records, shall be closed and placed in an inactive file. The prosecutor may disclose the existence of an adjudication for juvenile delinquency only when such disclosure is constitutionally required or after the court having jurisdiction over the criminal prosecution orders its disclosure.

N.H. Rev. Stat. Ann. § 169-B:36 (1999): It is misdemeanor to disclose court records, except as provided in § 169-B:37. However, in cases involving violent crimes, the clerk of the court may disclose the following after an adjudicatory hearing: the name and address of the juvenile charged; the specific offense; the custody status of the juvenile; and the final disposition ordered by the court.

N.H. Rev. Stat. Ann. § 169-B:37 (1999): It is a misdemeanor for the news media to publish identifying information about juveniles without court permission, or to make public any juvenile court proceedings. However, information about the disposition of cases involving acts that would be felonies if committed by an adult may be published. In addition, the police, with the written approval of the county attorney or the attorney general, may release to the news media the name and photograph of the juvenile if: the juvenile has escaped from court-ordered custody; the juvenile has not been apprehended; and there is good cause to believe the juvenile presents a serious danger to the juvenile or to public safety.

N.H. Rev. Stat. Ann. § 169-B:38 (1999): The publisher or any newspaper or manager of a radio or TV station who violates
§ 169-B:37 is guilty of a misdemeanor.

N.H. Rev. Stat. Ann. § 169-B:46 (1999): Publication is permitted in cases involving charges of vandalism or controlled drugs.

Forbidding Publication: An adult witness who had acted as an informant in a child pornography case was not entitled to have his identity protected, despite the fact that the witness was a minor when he was involved in the creation of various pornographic materials allegedly possessed by the defendant. United States. Bateman, 805 F. Supp 1058 (D.N.H. 1992).