Yet, once it does exist, it's no longer scarce. Unfortunately, you can't own something that doesn't exist yet so that doesn't help you at all. The paper the blueprints are printed on would still be scarce but not the content therein. This seems pretty simple so maybe you are trying very hard not to understand?
How do you know. Perhaps I have the blueprints in front of me. 
So even though I'm the only one with access to the content, it's not scarce?