To ensure you have licensed your software properly, I would suggest to include a proper COPYING file, with a proper declaration of the GPL license. I have included GPL versions 1, 2 and 3 in the attached tar.gz file, use whichever you believe is appropriate.
Also, utube/UTube.sh is a shell script and an executable - as such, it should contain a comment in the header with the GPL license. Example:
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
