I'm not an expert, Pollo, but to me the difference is this: bootleg CD ~ one that's either (a) stolen, or (b) sold to you as genuine when it isn't. pirate CD ~ one that's been deliberately and knowingly illegally reproduced.
i.e. bootleg, more emphasis on the way it comes to be in your possession; pirate, more emphasis on how the item is manufactured.
There are people whose hobby is collecting old bootlegs. If you look on eBay, you'll see many bootleg CD's and records for sale -- advertised as bootlegs. They were all intentionally, knowingly, and deliberately copied and sold. Bootlegs are mass-produced. A single illegal copy cannot be a bootleg.
A single illegal copy is a pirated copy. Today many people use the internet to download and make pirates of CDs. It's also possible to buy illegal pirates on the black market. Pirates can be mass-produced too.
mass-produced illegal copy = bootleg or pirate
personal-use illegal copy = pirate
Like I said, Rose, I'm no expert, and probably shouldnt've posted in the first place.
Having said that, I do stand by my (personal) BE interpretation in which my definsitisisons are the other way round to yours.
Good to see usual WR standards are in force! ;-) For me bootleg and pirate are synonyms at least if they are in front of the word CD or DVD. These days at my local supermarket I often come across people hawking the things. The quality is often really poor to the extent that if you are watching a film you occasionally the back of someone's head getting up. I suspect pirate is probably more used than bootleg.