Thanks, for your response. Yes, it was part of a package with 360, but as each item was listed separately (and was priced separately), I assumed they were separate products, so didn't have to install Anti Theft on the same three devices as 360. It seems I was mistaken. I guess this means that the only other device I can download Anti Theft to is my Desktop and there doesn't seem much point in doing that. I think you've answered my question though.