WorshipPlanning.com offers no special licensing to legally permit sharing copyrighted content with others on your team. However, there is a new Church Rehearsal License provided by CCLI that will permit you team members to legally access your digitally distributed music (including sharing it via WorshipPlanning.com). More information about this license can be found at http://rehearsal.ccli.com/
The copyright issue is a very hot topic these days, largely because there are many questions about what is legal and what is not. Churches seeking answers to copyright questions might consider visiting Christian Copyright Solutions at http://www.copyrightsolver.com.