Is money earned from selling forbidden films and songs prior to repentance considered an illicit gain, and how can one dispose of this money if it has become mixed with lawful money?

Opening an internet cafe where one hears and sees unlawful things like movies and songs is a sin that necessitates repentance. If it is possible to control the websites and the games are free of music and the like, then there is no objection to continuing with the project. Money earned from forbidden movies and songs should be given away in charity if possible; otherwise, one is not held accountable for what has passed, because "to him belongs what has passed."