How can place software in the public domain Business

         Public-domain software is software that has been placed in the public domain in other words, there is absolutely no ownership such as copyright, trademark  or patent. Software in the public domain can be modified, distributed, or sold even without any attribution  by anyone; this is unlike the common case of software under exclusive copyright  where software licenses grant limited usage rights. This kind of freely distributed and shared "free software" combined the nowadays differentiated software classes of freeware,Shareware and  free and Open-source software and was created in academia, and by hobbyists and hackers.