Explanation:
Intellectual property rights are protected to improve the economic growth of the country. This encourages people to make innovations, research and creations. The length of the property rights protects the invention from being copied by others. The scope of the protection is ensure fair use of the creation.
The copyright is for the life of the author and 70 years after that which is a very long period of time. If the length is reduced it can be made use by other authors or public in their work.