ilmaisutaidot

Ilmaisutaidot, also known as free software, refers to software that is distributed with the freedom to use, study, modify, and distribute the software, and to distribute modified versions of the software. This concept is based on the four essential freedoms outlined by the Free Software Foundation (FSF):

1. The freedom to run the program as you wish, for any purpose.

2. The freedom to study how the program works, and change it to make it do what you wish.

3. The freedom to redistribute copies so you can help others.

4. The freedom to distribute copies of your modified versions to others.

Free software is typically distributed under a license that ensures these freedoms are preserved. Examples of such licenses include the GNU General Public License (GPL) and the MIT License. The term "free" in free software refers to freedom, not price, meaning that users are free to use, modify, and distribute the software without any restrictions.

Free software is often contrasted with proprietary software, which is software that is distributed with restrictions on its use, modification, and distribution. Proprietary software is typically distributed under a license that requires users to accept the terms and conditions set by the software's author or distributor.

The concept of free software has had a significant impact on the software industry, leading to the development of many popular and widely-used software applications. Examples of free software include the Linux operating system, the Apache web server, and the LibreOffice office suite. Free software is also used in a wide range of other applications, from scientific research to education to entertainment.