The script /usr/sbin/grub2-set-password is created in the grub2 SRPM by the
patch file 0028-Add-friendly-grub2-password-config-tool-985962.patch as of
RHEL 10. (The patch number varies - in RHEL 8, for instance, the file is 
created by SOURCES/0063, SOURCES/0192, and SOURCES/0192.)

The script as generated has no copyright nor licensing information 
associated, and consequently is not free software. It needs a license 
attached.