Looks fine to me, but I'll let Bastien decide.
Maybe "... that this is free of licensing terms" sounds a bit better? You decide :)
I think we should have a dedicated design task for the duplication issue, this is a general problem.
I think this can be closed now, the Nodes & Physics module has been working on this, and a bunch of functionality is in the main branch already.
Anything to add @SimonThommes @dfelinto…
Let's not deprecate the author field, this may still be useful in some cases (e.g. to know who to contact in case of unclear copyright). We can just show a bunch of metadata fields, if people don't need it, they just don't set it.
Similar thing here, suggest something like: "Name of the license the asset is distributed under. An empty license name does not mean there are no licensing terms. Contact the author if any clarification is needed."
The description isn't adding much information, but I'm also not sure what to put in there. Maybe: "Copyright notice of the asset. An empty copyright notice does not mean there are no copyrights assigned. Contact the author if any clarification is needed."