is compatible license of has website homepage GNU GPL v3 GNU GPL v2 LPPL v1.2 https://latex-project.org/lppl/lppl-1-2.html LPPL v1.2 is a free software license (by the defintion of the GNU Project), This license is an incomplete statement of the distribution terms for LaTeX. While it is a free software license, it is incompatible with the GPL because it has many requirements that are not in the GPL. Software projects other than LaTeX rarely use it. Latex Project Public License v1.2 Modified from http://en.wikipedia.org/wiki/LaTeX_Project_Public_License, accessed 12 June 2013; modified from http://www.gnu.org/licenses/license-list.html, accessed 12 June 2013. LPPL