Normally, "bootleg" refers to goods illegally sold and distributed, without proper taxation, and at a loss to the original manufacturer of the goods. This can apply to anything, from booze to cigarettes to designer jeans, etc, as long as it is sold and distributed by other than legal means. Today the term is primarily used to describe stolen audio/video recordings that are illegally sold and distributed on the Internet.
I know all about counterfeiting, pirating and bootlegging because I sell bootleg CDs and other material on the Internet. Give me a call if you need anything.