If your add-on modules are dynamically loaded into GPL-licensed software at runtime, you’ll have to license the add-on modules under the GPL’s terms when distributing them along with the GPL-licensed software; it is a clear-cut case of a “derivative work” under the License. The case is less clear, however, if the add-on module is distributed separately from the GPL-licensed software, as may, for example, happen where the recipient has already installed the GPL-licensed software from a different source. Continue reading →