This example shows how to deal with the GNU style licenses such as GPL, AGPL, LGPL, and GFDL
license = "GPL-2.0-or-later AND LGPL-3.0-only"
[licenses] allow = [ "GPL-3.0" ] copyleft = "deny"
GNU style licenses deviate from most of the other licenses in the SPDX license list due to the way they use the -only and -or-later suffixes appended to the root name and version of the license. In this example, by allowed GPL-3.0 we satisfy the requirement of GPL-2.0-or-later, but because we deny copyleft, the LGPL-3.0-only is still rejected.