The police did during Tuesday raids against two people in Växjö and Borås suspected of copyright infringement. The operation was directed against the site TTI.
According to prosecutors to site TTI have made available thousands of works, including films, using Bittorrent technology.
Servers that are suspected to contain the site's tracker, database and web site have been seized.
Two people sitting on Tuesday arrested but has now been placed on the loose. Both deny the crime.
According to prosecutor Frederick Ingblad, more people are assumed to have been involved in the operation of the site.