When we are dealing with items that have precise boundaries and are subject to the control of their owners, we are dealing in a moral area.

This gives us a concept where precision can be applied.  We know absolutely  how far our property rights go.  They go up to the boundaries of what we own, and can thus rightfully control.  The do NOT go beyond that boundary.

When we find ourselves in an area where the moral rules of property cannot be applied or invoked for one reason or another, we then fall into the area of manners.

Good manners are a civilized substitute for moral boundaries, where the latter cannot be determined.

Let us suppose for example, that a man enjoys eating onions. He purchases them and he eats them.

This man wishes to go out on a date with a woman who becomes ill if she has to smell onions.

The man has a right to eat the onions.  The woman has a right not to have to smell them.  How do we get around such a dilemma?

The question of the boundary of the onion odor is a problem we have not as yet solved, at least within a moral (property) context.

We cannot say that the man has a moral "right" to inflict an unpleasant odor on the woman.  However, we also cannot say that the lady has any sort of a moral right to prevent the man from eating onions. 

Thus, we are in an area where manners apply, and not the moral concepts of property.