Public domain materials have no limitations.
"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 software is generally made available at no cost.
Public domain software is generally made available at no cost.
Public domain software
You can. If the torrent is for copyrighted software that you are not legally entitled to have then you can be prosecuted for copyright violations. If the torrent is being used to distribute free or public domain software then the use is legal and legitimate.
PSP games are copyrighted pieces of software. They are not public domain. Downloading any PSP game without paying the publisher/developer is illegal.
The most popular example of software in the public domain is SQLite. There isn't too much software in the public domain, as most of it is licensed under a very permissive free software license, like the BSD license.
Examples of public domain software include the GNU/Linux software, which forms a part of many PC operating systems.
No, using a video from the public domain in a presentation is not illegal because public domain content is not protected by copyright. Make sure to verify that the video is truly in the public domain and not mistakenly labeled as such.
Public domain software, particularly open source software, stems from the Free Software movement of the early days of computing. While proprietary software (such as Microsoft products) can be expensive and slow to adapt, open source software is freely distributed, and updates are essentially crowdsourced. Applications can be customized for a particular industry or individual at no cost.
public-domain software
I think you mean Cheapware; one of software issues that -free public - domain software,