Philippe Ombredanne: > This + is a suffix and not a freestanding character, right? > Then again we would be better off to get rid of the plus entirely!
You may be confusing a SPDX "license identifier" and a SPDX "license expression". It's a subtle point. The purpose of a "license identifier" is to identify a specific text of a specific license text, using a short name. In SPDX 2.0 there is no "+" in a standard license identifier. In particular, "GPL-2.0" is a license identifier, and "GPL-2.0+" is *NOT*. If all you want to do is identify a particular license text, use a license identifier. No "+" exists at the end of a license identifier. However, a "license identifier" is often inadequate for describing the licensing requirements imposed on users and later developers. Many packages have different subcomponents with different licenses. Many packages include the text of some license (such as the GPL version 2.0), but there are often two possible cases: - You must use this particular version of the license. - You may use this or any later version of the license. Thus, SPDX 2.0 defines a "license expression" for describing how license texts apply to software packages,. A license expression is built out of license identifiers but adds ways to describe how the license texts are used. A "+" appended after the name of a license identifier means "or any later version may also be used". E.G., the license expressions "(GPL-2.0+ WITH Classpath-Exception-2.0)" and "(MIT AND BSD-3-CLAUSE)" express how the license text requirements are imposed on recipients (users and developers). License expressions use the long-standing convention is that if software is licensed using "this or any later version" you add a "+" to the name of the license. You can argue that the "+" should be the default, but standards typically work best if they build on pre-existing conventions, and that was certainly the case here. --- David A. Wheeler _______________________________________________ Spdx-tech mailing list Spdx-tech@lists.spdx.org https://lists.spdx.org/mailman/listinfo/spdx-tech
