Open means:- Free from limitations, boundaries, or restrictions.Hence can be accessed by others.
Procurement,upgrade and continued use of Open Source Software is mostly at minimal cost! Open Source Copyright laws allow for copying, redistribution, sharing and modification of software productswithout paying royalties/licenses.
Examples include: Mozilla, Linux, FreeBSD, OpenOffice, etc. Open source refers generally to any computer software whose source code is either in the public domain or, more commonly, is copyrighted by and distributed under an open-source license such as the GNU General Public License (GPL) http://www.gnu.org/ . Such a license gives users the freedom to run the program for any purpose, to study and modify the program, and to redistribute copies of either the original or modified program (without having to pay royalties to previous developers).
Open source software may or may not be "free". However, commonly used open source software products are free.
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