> "exclusive Right for limited
> Times" is rather concrete concept, but the "intellectual
> property", on the
> contrary, is a broad and generic concept
  In general usage, but not in legal usage.  The text "Law and
Economics" (ISBN 0-673-46332-X) p. 72, under "The Legal Concept of
Property" says "From a legal viewpoint, property is a 'bundle of
rights'.  These rights describe what people may and may not do ...,
the extent to which they may ... or exclude others from their property.
These rights are not immutable; they may, for example, change from one
generation to another.  But at any given point in time, they constitute
the detailed answer of the law to (1. How are ownership rights
established? 2. What can be privately owned? 3. What may owners do with
their property? 4. What are the remedies for the violation of property
rights?)"  So the legal term "property" is really quite general, which I
agree is confusing when the term is used in common speech.