GPluginPluginInfo:license-id

The short name of the license.

It is recommended to use the identifier of the license from https://spdx.org/licenses/ and should be “Other” for licenses that are not listed.

If a plugin has multiple license, they should be separated by a pipe (|). In the odd case that you have multiple licenses that are used at the same time, they should be separated by an ampersand (&).