What is the ruling on opening a shop for buying, selling, and maintaining computer devices, and a shop for printing, photocopying documents, and translation?

It is permissible to work in the computer field (selling, buying, and maintaining), photocopying papers and documents, and translation and printing, unless the work involves something forbidden; such as selling music CDs and forbidden movies, or selling devices to someone who is certain or most likely to use them for forbidden purposes, because Allah Almighty has prohibited cooperation in sin and aggression.