Critics of Udio have questioned what data was used to train it and if that data consisted of copyrighted music. Rolling Stone wrote that there was "substantial reason to believe" that both Udio and Suno AI were trained with copyrighted music, while Benj Edwards of Ars Technica wrote that its training data was "likely filled with copyrighted material".[9][10] Udio does not directly recreate copyrighted songs if prompted.[6] Ding has stated that Udio has "extensive automated copyright filters" and that the company is "continually refining [its] safeguards".[7] Stability AI took a different approach with Stable Audio 2.0, and used an explicitly licensed dataset of music called AudioSparx.[15]