I have been quite clear and explicit about which sense of the word property I have been using - and have previously given dictionary definitions from multiple sources. Here are a few more related to the context of this discussion (since, obviously, there are other senses, such as theatrical properties, that are not relevant):
Business Dictionary = and intangible property (intellectual property). [Links to the definition of intangibles as:] Bonds, notes, shares (stock), long-term contracts, and rights (
such as lease agreements and copyrights) which represent present or future value but, being mere documents, have no intrinsic value of their own.
Wikipedia on Intangible Properties = intangible property is traditionally divided in pure intangibles (such as debts, intellectual property rights and goodwill) and documentary intangibles, which obtain their character through the medium of a document (such as a bill of lading, promissory note or bill of exchange).
financial dictionary = Any tangible or intangible thing that is or may be owned by someone.
So when you say "not generally what one considers property" perhaps you could give some evidence of that (which is relevant to this discussion)? Likewise for "property implies a permanence".
I can imagine that someone not involved in business or accounting might not give much consideration to intangibles, but that is why I have been clear about the context I am using.