"Commercial licensing terms for distribution on Solaris" means that if a 3rd party would like to include dvd+rw-tools [or their components] as a part of commercial product for Solaris, then they have to talk to Inserve Technology. In other words Inserve Technology is granted exclusive right to include dvd+rw-tools in commercially available product for Solaris™. But no explicit permission/license is required, if a commercial [or any other] party chooses to download and deploy them internally in their Solaris environment, e.g. for internal backup purposes.