YaST licensing

Hey Stefan, I was wondering if you could clarify something for me. I'm developing a YaST UI for a commercial product that includes ycp files for the ui and perl SCR agents (that use the ycp.pm api). SuSE has GPL'd the YaST toolkit but software that utilizes the toolkit is not considered derived correct? (meaning if I write these modules then I am _not_ obligated to release them if my employer doesn't wish to). Sorry if this seems an obvious question but I can't find any licensing information in the Perl files or Yast code (other than in the RPM to say it's all released under the GPL). Thanks, Dominic