The TeX Catalogue License Definitions: LPPL

The LaTeX Project Public License (lppl)

This software is copyright but you are granted a license which gives you, the "user" of the software, legal permission to copy, distribute, and/or modify the software. However, if you modify the software and then distribute it (even just locally) you must change the name of the software, or use other technical means to avoid confusion.

Please check the software's license before using the software.

Further information about the Catalogue Licenses is available.