This doesn't look legit. That being said.
I don't get it. Who would put up a banner like that? It could be A.) the Government or B.) Wahabi types.
If the government puts this up, then it means that it wants to stop illegal activities in these markets, as these places are obvious hubs of pirated material. But there is no news officially of this anywhere.
If the Wahabi types have done this, which seems likely, its probably because they want to sodomize everyone in Pakistan with their own brand of "right" islam.