My friend has a great blog post about this, from the perspective of a subjectivist. The whole thing is
worth reading, but I want to specifically quote the section that argues for the right to property as an example of what I am looking for (roughly).
I agree with all of that, but what makes the product of my mind (which also takes time and labour) any different from physical property?
You don't necessarily own the products of your labor. If you steal wood from me and make a chair, you don't own the chair. I own the chair and you owe me for damages to my wood.
By telling me what I can and can't do with my ink and paper, you are claiming ownership of my property, which is theft since it wasn't given to you voluntarily but rather under threat of violence or imprisonment.