I am trying to understand the meaning and value of "detected" and/or
"declared" as distinguished from "your best guess", i.e., "asserted".

I don't know about this one. Would this statement be representable in
a declared license file? It requires multiple facts and deduction

[...]

I haven't been in the spdx-team from the beginning on, so I do not
exactly know what the original purpose of these two license declarations
is. But judging from daily experience I assume it is to cover the
situation where there is neither a license file nor any licensing
comments in the source code, however it is known from other sources
(e.g. community website) that the software is licensed under particular
terms.

In fact there might be multiple facts and deductions involved.

In order to avoid conflicting license tags in one spdx file, wouldn't it
be more viable to have only one license tag, but an additional tag
determining the source of that license information (maybe in categories
like "license file", "documentation". "website[URL]", etc) ?

Cheers
Soeren



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