Лицензия

Ideal CMS является open-source продуктом, распространяемым под лицензией LGPL.

Описание, взятое с сайта choosealicense.com:

Primarily used for software libraries, LGPL requires that derived works be licensed under the same license, but works that only link to it do not fall under this restriction. There are two commonly used versions of the LGPL.

Required

Permitted

Forbidden

Полный текст лицензии LGPL v3.