To export iContent and use them in other 3D softwares (e.g. Maya, Max, DAZ), or 3D game engines (e.g. Unity, Unreal), you will need to purchase the export license version of the iContent. Export license is an upgrade of iContent License which allows you to convert iContent into FBX, OBJ or BVH formats through the use of 3DXchange Pipeline.
Learn about Export License vs. iContent