The incident occurred on December 4 last year.
The man, who is in his 35s, had called the gate phone at Haga Palace and said he wanted to talk to the Crown Princess. He also wanted to hand over documents to her, according to several media outlets.
The palace guard alerted the police, who were able to apprehend the man after a brief chase.
At the time of the arrest, he had, among other things, a hammer and two knives on him, objects that according to the indictment were feared to have been used in a criminal attack.
In addition to gross violation of the knife law, the man was initially also suspected of preparation for gross bodily harm, but the investigation has not been able to substantiate these suspicions.
"We have not been able to find any indication that a physical attack was planned from the defendant's side. The suspicion of preparation for gross bodily harm is therefore dropped, and the indictment only includes the possession of the knives and the dangerous objects," writes prosecutor Carl Mellberg in a comment to TT.
According to the indictment, the police also seized an air pistol and five pairs of handcuffs from the man, who denies the crime. He claims to have had the weapons for self-defense.
The Security Police have conducted the investigation against the man.