The man once considered Scandinavia's worst serial killer but later cleared of his crimes has said his lawyer is preparing a claim for damages, following his release after more than 20 years in psychiatric detention.
"What happened was lamentable, we're talking about murder verdicts in eight cases, something that should not happen," Sture Bergwall said in an email interview on Friday, two days after his release.
"The Swedish judiciary has been naive ... It's very frightening that I could have been convicted - and of course it raises the question of how many more innocent people have been convicted."
Bergwall, 64 - who used the alias Thomas Quick during the 1990s when he confessed to cannibalism and more than 30 murders - was convicted to life imprisonment for eight of them and held at a psychiatric ward in Saeter in north central Sweden since 1991.
He was later cleared of all the murders due to lack of evidence, amid revelations he had been heavily medicated at the time of the confessions and had made them in return for more drugs and to seek attention.
As a free man he said he would spend his time walking in the countryside and writing a new book - a follow-up to his 2009 book Thomas Quick is Dead, a phrase he has often used to describe the point where he dropped the pretence of being a psychotic killer.
That point came in 2008 in a Swedish TV documentary in which he withdrew his confessions.
By then he had earned an international reputation as Sweden's Hannibal Lecter.
"As Thomas Quick the comparison is maybe true but Thomas Quick is dead and there ends all similarities," he told AFP.
Some analysts suggest a claim for damages may be far from straightforward, given that Bergwall contributed to putting himself behind bars by confessing to crimes he did not commit.
A number of high-ranking opposition politicians and legal experts have called for an independent commission to examine how Swedish courts could have convicted him despite the lack of evidence.
Justice Minister Beatrice Ask announced an inquiry in 2013.
