Preparing promotional material for Riba-based banks

Q: Is it permissible for me to design nameplates, seals, and promotional material for banks that deal in Riba (usury/interest) - may Allah purify us from it? Am I also sinful to design such items for photographic shops and shops that sell music tapes? Please advise me in detail about this.

A: It is not permissible to cooperate with those who commit Islamically prohibited deeds in their perpetration of these wrongs, such as dealing in Riba and taking photographs as a profession and earning money from doing so. The same applies to those who sell Haram (prohibited) music tapes. Allah (Exalted be He) says: Help you one another in Al-Birr and At-Taqwâ (virtue, righteousness and piety); but do not help one another in sin and transgression. (Part No. 14; Page No. 435) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.