If the program is written by US federal government employees in the course of their employment, it is in the public domain, which means it is not copyrighted. 如果这个程序是由美国联邦政府雇员在其雇佣期间内编写的，这个程序就处于公共领域，这意味着它不是版权所有的。
copyrighted英英释义
Adjective:
(of literary or musical or dramatic or artistic work) protected by copyright;
