Need to change "copyright" to "license" in spec file for rpmbuild

[Cylinder]

I attempted to build an rpm on Fedora 35 from bzflag-2.4.24.tar.gz with
rpmbuild -tb bzflag-2.4.24.tar.gz
It quickly quits with
error: line 26: Unknown tag: copyright: Copyright (c) 1993-2021 Tim Riker
Apparently the "copyright" tag in spec files has been long deprecated, and one must now use "license" instead. When I replace the "copyright" tag with a "license" tag in the spec file, the rpmbuild command works.