The software copyright of natural person will be protected all his/her life and within 50 years after his/her death. The software is jointly developed, so its protection period will be expired on Dec. 31 of the 50^th year after the death of the last natural person. The software copyright of legal person or other organizations will be protected within 50 years after its releasing. However, the software that has not been released within 50 years after the development will not be protected.