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All the applications available in this site are free and open-source: 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.
However, please be noted that these applications 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 (http://www.gnu.org/licenses/) for more details.
The above-explained disclaimer applies to all the applications, including the following ones available in Google Play or/and F-Droid, provided by the developer (sunilpaulmathew).