(CNN) Katy Perry's 2013 song "Dark Horse" was copied in part from "Joyful Noise," a song by Christian rap artist Flame, a Los Angeles jury decided Monday, according court filings obtained by CNN.

The unanimous decision from a nine-person jury came after a week-long trial, during which Perry testified about the track's creation. She was not in the courtroom when the verdict was read, Variety reported.

Flame, whose real name is Marcus Gray, argued that "Dark Horse" infringed on his copyright by using an underlying beat from his song without permission, according to court filings. Perry's attorneys argued, in part, that the portion in question was too common and brief to be protected by copyright, Rolling Stone reported.

The penalty phase of the trial will begin Tuesday to determine damages owed by Perry and her co-writers.

Co-writers named in the suit include Dr. Luke, whose real name is Lukasz Gottwald; producer Max Martin; producer Cirkut, whose real name is Henry Walter; songwriter Sarah Hudson; and rapper Juicy J who was featured on the track.

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