Property is about the boundaries of what one can control, not about physical stuff and land. What makes property property is not physical boundaries and the tangible nature of a thing, but the fact that you can control who gets to use what you possess and under what conditions, backed by the power of the state. In states with copyright laws, this applies equally to land and widgets as it does things you write.

Property being about land and geographical boundaries is one of the most common misconceptions that gets shattered in the first few weeks of a first-year course on the subject in law school.