No. But you may need to be quite careful about whether a particular piece of software is actually public domain, i.e., its copyright has expired or it never had any copyright (if published prior to 1989, or a work of the US government).
Public domain software is generally made available at no cost.
Public domain software
"Public domain software" is software that has moved into the public domain. You're free to copy, display, sell, or adapt it. No one owns the copyright on that software.
Public domain images have no copyright restrictions.Creative Commons images are protected by copyright, but have extremely broad licenses.
public-domain software
In terms of intellectual property "public domain" refers to items that have no restrictions of use due to expiration of legal controls (patents, trademarks, copyright)
Works no longer protected by copyright are said to be in the public domain.
If the music is within the public domain, then it's by definition not subject to copyright restrictions. There may be copyright issues in other countries, however, since the exact terms of copyright vary from location to location. Also, you may want to consult an attorney to be certain that the work really is in the public domain (there are occasionally misunderstandings about what that term actually means).
There are no restrictions on the use of materials in the public domain.
Asa work of the federal government, the medal is in the public domain. There may be non-copyright-related restrictions to medal use, though,
Pubic domain occurs naturally when a copyright expires. In theory, a copyright owner can intentionally disclaim any power to enforce a copyright, making it as if it were "public domain".
Yes, there are public domain illustrations from "The Wind In The Willows" by Kenneth Grahame. Many of the original illustrations by Paul Bransom are now in the public domain as they were published before 1923 and are free to use without copyright restrictions.