A store sells duplicates of DVDs in the center of town for very cheap. The DVDs are sold openly, Is there a problem in buying them?

It’s very obvious that these DVDs were copied illegally. It is a copyright violation for a business purpose, which is prohibited according to all major Poskim. Rav Moshe Feinstein Z”L considers it to be theft. It is prohibited to buy from a thief, in order not to support him and not to encourage him to rob. Therefore one should not buy those DVDs. [אג"מ או"ח ד סימן מ אות יט, שו"ע חו"מ סימן שנו סעיף א]