Create COPYING file of licence GPL-3.0-or later from https://spdx.org/licenses/GPL-3.0-or-later.html and make a PR to this below repo of VideoCutTool back-end.

Code repo: https://github.com/gopavasanth/video-cut-tool-back-end

Reference: https://github.com/gopavasanth/video-cut-tool-front-end/blob/master/COPYING