The initial version of Halcyon IDE was released with MIT license, but later changed to GNU General Public License version 3 (GPL-3.0).

    Copyright (C) Halcyon IDE <https://halcyon-ide.org/>
    Author & Project Lead : Sanoop Thomas

    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/>.