adj.版权所有的
动词copyright的过去式和过去分词.
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。
