The commercial license covers OpendTect optionally extended with closed source commercial plugins. These plugins offer unique functionalities and work flows. Commercial users can either purchase or lease the closed source plugins that are protected by license managing software and they are given priority access to maintenance & support.
DGB OpendTect Commercial v4.2.0g MACOSX-Lz0
an open source seismic interpretation software system for processing, visualizing and interpreting multi-volume seismic data, and for fast-track development of innovative interpretation tools. Optionally OpendTect can be extended with (closed source) commercial plugins.