Kaczynski is serving life in a federal prison in Colorado.

The Unabomber terrorized academic communities in the early 1990s with mailed bombs that killed three and injured 23 people. Major U.S. newspapers were forced to print his "Manifesto."

But the FBI caught up with Kaczynski in 1996 after getting a tip from his brother. At his small Montana cabin, agents found "papers, books, Kaczynki's writings, guns, bomb-making materials and instructions on making bombs using store-bought items," the court said.

Kaczynski tried to get the items back by going to court in 2003. After his case went up and down the appeals court ladder, the federal government came up with a plan in 2006 to sell his writings and books (with victims' named edited out) for the victims in a "well-publicized international sale," sell his weapons to named victims for $300 and destroy his bomb-making materials.

When a federal judge approved the plan, Kaczynski appealed, eventually representing himself.

Friday, the appeals court said the judge acted correctly in approving the plan.