BatS- I have heard that form rav Belsky as well. Add my own 2 cents.
Vahavta Lrayacha…….. if you would have invested 50-60G to produce a CD……. if you would have invested hundreds of hours producing music for the Tzibbur… would you be happy/agree/ want people to buy it or copy it? Gotta feel for another Yid! No?
Moreover in Halcha if the purchase was made on condition that it not be copied under any circumstance , and by buying you tacitly agree to the terms, is it then permitted to violate the conditions or close you eye when someone borrows it to copy?