The Colorado Supreme Court says a sheriff can refuse to release videotapes and writings made by the Columbine gunmen before the high school massacre.
However, the justices also say the sheriff's refusal is subject to court challenge.
The Jefferson County sheriff's office seized the material from the homes of Eric Harris and Dylan Klebold shortly after the two killed 12 students and a teacher and committed suicide in April 1999.
The Denver Post filed suit seeking the material after the sheriff's office refused to make it public.
The material includes the "basement tapes," videos on which the teens show off their arsenal and talk about their plan to attack the school. Also included is a journal by Harris' father.