Re: [spdx-tech] Are there SPDX placeholders?
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I'm not aware of a standardized license expression that would be used _in a short-form source code identifier_ to express these cases.
Within the context of an SPDX document, one can use NOASSERTION to mean several different things that kind of boil down to "I'm not making any statement about what license applies"; and NONE to mean there is no license for the file. See 
You could also define a LicenseRef- expression to mean whatever you wanted.  has some details about how LicenseRef- expressions work, though again primarily for use in the context of an SPDX document. The REUSE Software spec  describes a way to use LicenseRef- expressions together with where to put copies of the corresponding license text.
Regardless, though, if this is code that you are looking to release as part of an open source project, I'd say community expectations are typically that it should have a specified license -- not a "license TBD" notice. If the license is TBD then downstream users, redistributors, etc. won't know what their rights or obligations are. So a project in this situation might want to wait until a license has been selected, and then just start using the corresponding identifier.
On Mon, Sep 16, 2019 at 5:19 AM Kate Stewart <kstewart@...> wrote: