The Copyright Act gives a copyright owner the exclusive right to reproduce the owner's work. A copyright infringement suit is an example of court enforcement of a statute. According to the Copyright Act, the copyright in a work created by an employee within the scope of his or her employment is owned by the employer. The Supreme Court case that defines the term is an example of court interpretation of a statute. The courts invalidate unconstitutional laws.
Unconstitutional laws are laws that conflict with provisions of the Constitution.
The Constitution is the supreme law of the United States. In Roe v. Wade, the Supreme Court invalidated a state statute restricting women's access to abortion. According to the Court, the statute violated a pregnant woman's constitutional right of privacy. Common law covers areas not covered by statutes. There are several types of courts.