We believe that the main distinguishing feature between a Module and a Plugin, is one of size and complexity. However there may be some more subtle differences that will develop in our listings over time.
Both Modules and Plugins are packages of source code. As with Themes and Templates they may attract a charge to download or be free. The code may be straightforward source code or it may be obfuscated. We do not have any plans at this time to support facilities such as Source Code Guardian©.
The introduction of a third party Module or Plugin is not monitored or controlled as it with some systems. We recommend that you follow the author’s instructions closely to install the additional code. Subsequently, the source code files may be included in the Site Update files list.
See the page on what we are doing for partners and contributors which is accessible from the link on the footer.