Licensing has become very important in our world of commerce. Permissions of usage for originally created materials, especially concerning spiritual materials, can be a controversial subject. Can we license the Scriptures, since they are given by God? Should we limit the access to the Scriptures? The same can be said of worship songs, especially if they are the kind specifically given by the Holy Spirit.
As far as the Scriptures are concerned, we should not make that a tool for commercial gain. That would be hypocritical to the content of the Scriptures themselves.
As for divinely inspired worship songs, we should be more careful with those. They inspire people emotionally. So we should not condone groups who worship false gods by allowing the use of these worship songs. Our licenses reflect these beliefs.