The simplest way to make a program free is to put it in the public domain, uncopyrighted. This allows people to share the program and their improvements if they are so minded.
But it also allows uncooperative people to convert the program into proprietary software. They can make changes, many or few, and distribute the result as a proprietary product. People who receive the program in that modified form do not have the freedom that the original author gave them; the middleman has stripped it away.
Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. For example, what is open-source software , and how does it differ from free software , what is permissive and copyleft.
We will also summarize the terms of use of the most popular licenses. To dig deeper into the topic, you will find a few useful links in the end. These definitions do NOT refer to the types of the software, but to the values lying underneath.
They might intersect in various manners and refer to the same set of licenses. For example, the majority of free software licenses are also considered open-source software licenses, like well-known Linux, Ubuntu, MySQL, to name a few. Look at the table below to evaluate similarities and differences between free and open-source software, public domain and freeware, and some examples of known relevant software:.
These terms are used to compare legal attributes of open-source and free software and other content publicly available licensing to proprietary licenses. Permissive licenses place minimal restrictions on software users. Often they only require that the original creators are attributed in any distribution or derivative of the software or source code. For example, the software under permissive license may be incorporated into the other proprietary software without disclosing the source code, and this newly created software may be distributed.
The core requirement that any derivative work must be distributed under the same licensing terms as the original. Creative common is most commonly applied to various content that used along with software i. There are 6 Creative common licenses , which we will not cover in this article. Although there is an enormous amount of various licenses on the market, we will cover only a few most popular ones, which we at Moqod frequently use for developing projects for our clients.
Here are the most popular open-source licenses in a simplified comparative table and a brief outline one by one:. Apache 2. It is written clearly regarding the modern copyright usage rules, in particular, patent relationships. Apache-licensed software can be used in your commercial project for free. The only restriction is trademark use:.
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