A regular license allows a script to be used in one project for either personal or commercial use by you or your client. The script cannot be offered for resale either on its own or as part of a project. Distribution of source files is not permitted.
An extended license allows a script to be used in unlimited projects for either personal or commercial use. The script cannot be offered for resale "as-is". It is allowed to distribute/sublicense the source files as part of a larger project.