License-free software

License-free software is computer software that is not explicitly in the public domain, but the authors appear to intend free use, modification, distribution and distribution of the modified software, similar to the freedoms defined for free software. Since the author of the software has not made the terms of the license explicit, the software is technically copyrighted according to the Berne convention and as such is proprietary. Examples of license-free software formerly included programs written by Daniel J. Bernstein, such as qmail, djbdns, daemontools, and ucspi-tcp. Bernstein held the copyright and distributed these works without license until 2007. From December 28, 2007, onwards, he started placing his software in the public domain with an explicit waiver statement. Additionally, small scripts are frequently released without specifying a license. For example, the website Userscripts.org hosts more than 52,000 Greasemonkey user scripts, the majority of which have no specified license. Similarly, GitHub reported in 2015 that 85% of the projects it hosts are unlicensed. On his Software users' rights web page, Bernstein explains his belief that under the terms of copyright law itself software users are always allowed to modify software for their own personal use, regardless of license agreements. He says '"If you think you need a license from the copyright holder, you've been bamboozled by Microsoft. As long as you're not distributing the software, you have nothing to worry about." He also says that software users are allowed to back up, to compile, and to run the software that they possess. He further says that "since it's not copyright infringement for you to apply a patch, it's also not copyright infringement for someone to give you a patch," noting the case of Galoob v. Nintendo'' as precedent. Thus modified versions of license-free software can legally be distributed in source code form in whatever way that the original can, by distributing a patch alongside it.

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Public-domain software

Public-domain software is software that has been placed in the public domain, in other words, software for which there is absolutely no ownership such as copyright, trademark, or patent. Software in the public domain can be modified, distributed, or sold even without any attribution by anyone; this is unlike the common case of software under exclusive copyright, where licenses grant limited usage rights.

Free-software license

A free-software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that software. These actions are usually prohibited by copyright law, but the rights-holder (usually the author) of a piece of software can remove these restrictions by accompanying the software with a software license which grants the recipient these rights. Software using such a license is free software (or free and open-source software) as conferred by the copyright holder.

Public domain

The public domain (PD) consists of all the creative work to which no exclusive intellectual property rights apply. Those rights may have expired, been forfeited, expressly waived, or may be inapplicable. Because no one holds the exclusive rights, anyone can legally use or reference those works without permission. As examples, the works of William Shakespeare, Ludwig van Beethoven, Leonardo da Vinci and Georges Méliès are in the public domain either by virtue of their having been created before copyright existed, or by their copyright term having expired.

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