As this project is opensource and released under the GNU General Public License v2+, the sourcecode is freely available under that license.
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There is a Git web interface to the repository to browse the source code.
Information on checking out the sourcecode using Git can be found below.
Anonymous Read-Only:
git clone https://gitlab.linux.community/smradius/smradius.git
Code Contribution Guidelines: Using GitLab Code Submission Policy