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Simon Lundström was found guilty in 2010 by two lower courts of possessing 39 drawings that violated the country's child pornography laws, but the ruling has now been reversed.
The judge declared that while the artwork depicts minors and could be considered sexual in nature, the images could never be mistaken for real children, The Local reports.
"The criminalisation of possession of the drawings would otherwise exceed what is necessary with regard to the purpose which has led to the restriction on freedom of expression and freedom of information," the court ruled.
Lundström's attorney Leif Silbersky has spoken up in favour of the ruling, stating that he is glad "common sense prevailed."
He told the TT news agency: "It's heartening that common sense has prevailed. The Supreme Court has an excellent way of cutting through the formalities and coming to the right conclusion. The ruling is very good in its entirety."
