Hi Anthony,

This is not an error at all but reflects the changing of the ids for the GPL 
family of licenses at the behest of the FSF in 2017, while trying to not break 
things for those people who had already been using the previous ids for years 
prior. You can read more about it here: 
https://spdx.dev/license-list-3-0-released/

Thanks,
Jilayne
SPDX-legal co-lead

----

Hello

Looking at the latest version of the SPDX :License List (3.20) I have noticed 
that some licenses have multiple identities e.g.

--
"name": "GNU General Public License v2.0 only",
"licenseId": "GPL-2.0-only",
"licenseId": "GPL-2.0",
--
"name": "GNU Library General Public License v2 only",
"licenseId": "LGPL-2.0-only",
"licenseId": "LGPL-2.0",
--
"name": "GNU Library General Public License v2 or later",
"licenseId": "LGPL-2.0-or-later",
"licenseId": "LGPL-2.0+",
--
"name": "GNU General Public License v2.0 or later",
"licenseId": "GPL-2.0-or-later",
"licenseId": "GPL-2.0+",
--
"name": "GNU Lesser General Public License v2.1 only",
"licenseId": "LGPL-2.1-only",
"licenseId": "LGPL-2.1",
-
"name": "GNU Lesser General Public License v2.1 or later",
"licenseId": "LGPL-2.1-or-later",
"licenseId": "LGPL-2.1+",
--
"name": "GNU Lesser General Public License v3.0 only",
"licenseId": "LGPL-3.0-only",
"licenseId": "LGPL-3.0",
--
"name": "GNU Lesser General Public License v3.0 or later",
"licenseId": "LGPL-3.0-or-later",
"licenseId": "LGPL-3.0+",

According to https://spdx.org/licenses/ , there is only one identity e.g. 
LGPL-2.0-only specified for each license name.

When validating a license identity (e.g. within an SBOM) are both  identifiers 
valid or is this an error in the license data and I should only be using the 
license identifier as shown on https://spdx.org/licenses/, ?

Regards

Anthony


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