Final answer:
The conclusion of the argument is that software under copyright is not in the public domain based on legislation protecting intellectual property, which requires authorization to use copyrighted material.
Step-by-step explanation:
The conclusion of the argument is that software under copyright must not be in the public domain. This is based on the premises that software in the public domain can be copied without permission, whereas copyrighted software requires authorization for copying. Copyright is a form of protection provided by the laws of the United States for original works of authorship, which covers literary, dramatic, musical, and other intellectual properties. It legally prevents others from reproducing, displaying, or performing the work without the right holder's permission. State and federal governments have enacted laws protecting intellectual property, including copyrights and patents, to safeguard the economic rights of creators and prevent plagiarism or unauthorized use.