In perpetuity basically means indefinitely. The term is normally used in the context of intellectual property to qualify a period of protection that lasts indefinitely. Copyright protection subsists in a creative work for a finite period of time. The Berne Convention requires that this period of time be no less than the life of the author plus fifty years beyond his death. National laws are free to provide for a longer period of time, but perpetual protection does not currently exist in national copyright laws. Many indigenous peoples and traditional communities are of the view that protection for traditional cultural expressions should be perpetual, as this corresponds best to their needs and to the customary laws and values relating to these materials. In these licenses we do create a time-period so that if the need arises and change occurs, it can be accommodated.