You don't own the Blu-ray, which is the topic of this thread. Your ownership of the DVDs has no bearing on the discussion.
And by the way, I don't know anything about the complete scores, but let me guess. The soundtracks available for purchase are missing some of the music that you can find in the actual movies, correct? Well, you better own the movies if you want the music ripped from the movies.
Feel free to explain further how this is not piracy.