W. Trevor King:
> > ? = “unclear version” - this will be a new modifier to indicate there
> > is a lack of clarity as to the license version regarding if any
> > version, or later, or only applies, e.g., I found the text of GPLv2,
> > but I’m not sure if it’s “only “ or “or later” because there is no
> > other information.  Need further input on the exact word to use here,
> > i.e, “unclear” “maybe” “ambiguous"
> 
> The motivation for this operator seems to be a desire to say “I'm not actually
> comfortable drawing a conclusion, but here are some hints…”.

No, the issue is that there *is* some known information (e.g., GPL-2.0 at least 
is valid).
The problem is that some *other* information is *not* known (e.g., if GPL-3.0+ 
is valid for the package).


> Alexios raised the same concern in the “BSD” context [2].  I still think while
> there's not much point to concluding a licence if you're not willing to 
> actually
> make a call,

I disagree.  In many cases tools can't determine if "or later" is okay, and
99.999% of the time it doesn’t matter.  E.g., if I can't tell if it's
GPL-2.0 or GPL-2.0+, most of the time it makes no real difference.

> a good generic operator for representing this sort of thing would
> be “or maybe they meant” [3] (or some single-word form thereof).  That lets
> you represent all sorts of ambiguous declarations beyond the narrow “but
> I'm not sure which version operator they meant”.  For example, you can
> represent [4]:
> 
>   LGPL-2.0 OR-MAYBE LGPL-2.0 AND GPL-2.0 OR-MAYBE LGPL-2.0 OR GPL-2.0

That's an interesting idea. E.g., for the case previously discussed, we could 
say:

GPL-2.0 OR MAYBE GPL-2.0+

I'd be fine with a "MAYBE" operator.  That would address the primary problem I 
raised, and be even more flexible.  I don't know what others would think.

> We can provide warnings without an “unclear version” operator.  See the
> comments on metadata in [6,7].  What an “unclear version” (or “OR-MAYBE”,
> etc.) operator does is give you a way for the quasi-concluder to gripe about
> poor declarations (in a way that's obvious to human readers even without
> tooling) while still providing
> *some* information.  For example, if any possible GPL license grant is
> acceptable to you, maybe:
> 
>   GPL-2.0 unclear version
> 
> or:
> 
>   GPL-2.0 ONLY OR-MAYBE GPL-2.0+ OR-MAYBE GPL-1.0+
> 
> are acceptable to you without further digging.

I think the second version is much better.  It *looks* like a SPDX license 
expression.

--- David A. Wheeler

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