The CC BY-SA license only covers content. Tags are (apparently) considered metadata.
Feature request: Tags assigned to a question should be CC BY-SA licensed.
Answers to comments:
Why? What benefit/additional protection would this provide to the poster, content, reader, etc? How would renaming a tag, changing a tag to a synonym of another tag, or eliminating a tag be effected by putting them under a license? – 1201ProgramAlarm 1 min ago
Having a CC BY-SA license on the tag would allow anyone to reuse the tag info outside SE. (same argument as having a CC BY-SA license on the questions, answers and comments)
Anyone already can reuse the tag info, because it's not under copyright in the first place. That's why it has no license. It doesn't count as content. Adding a tag to a question doesn't qualify as a creative act. – OrangeDog 16 mins ago
Tag info can be viewed as annotations, which can have a license (example). No license does not mean public domain.
See https://data.europa.eu/sites/default/files/d2.1.2_training_module_2.5_data_and_metadata_licensing_en_edp.pdf (mirror) "Licensing of open (meta)data is important."
There appears to be some confusion here. The contents of a tag info page, (eg the
gdprtag has this info page: meta.stackexchange.com/tags/gdpr/info ) is covered by copyright, and as Adam Lear mentioned, it's plausible to add licensing info to the tag info page. However, there's also the action of adding a tag to a question (or removing a tag from it). That action doesn't modify the contents of a question, it modifies the metadata that the system uses to organise & display questions. – PM 2Ring 6 mins ago
I'm talking about the action of adding a tag to a question (or removing a tag from it).
The sources I am linking were on a question pertaining to editing the tags of a question, which seems relevant here.
You [should] expand on what exactly you mean by "allow anyone to reuse the tag info outside SE", given that you've also explicitly excluded the tag description? All that leaves is a word. – jonrsharpe 27 mins ago
I'm indeed talking about just one or several words/phrases assigned to a question. If a user do it on several/many questions, then I'm concerned it may become copyrightable (the same way labels assigned to texts in a dataset are copyrightable).
E.g. on https://stackoverflow.com/users?tab=Editors&filter=all one can see many users with over 10k edits, and these edits (which sometime include tag edits) are likely to be copyrightable given the amount of work the sum of them represent: