Again, you are comparing owning slaves to IP theft? Not everything that was done 200 years ago is automatically somehow more immoral today than it was then. IP theft would be one of these things.

i'm using your reasoning to reach an obviously false conclusion, in order to demonstrate that your reasoning is faulty and ill-considered. i am arguing about principles, and you are arguing special pleading.

No, you're arguing as if every single act one can perform is the same, morally speaking. You're reaching 'an obviously false conclusion', because you start with a reasoning that I don't hold. I don't think every action is morally equivalent, yet that's the premise you use in order to attack my argument.