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An open-source license occurs as right of first publication license for computer software that makes a source code available under terms that provide modification & redistribution while forgoing getting to pay the original creator. Such licenses will use at times extra restrictions like a requirement to preserve a title of a authors & the right of first publication statement inside the code. A single popular (& another time considered normative) placed of open source licenses are people approved per Open Source Initiative (OSI) based on their Open Source Definition (OSD).

Comparisons
There are too shared source licenses which have a few similarities by owning open source, however a total of critical differences produce such licenses incompatible sustaining the Open Source Definition.

A select few software package licenses define an open standard basis and will or even might not exist as similar to open source, rather occasionally versions of Solaris and PGP.

A Free Software Foundation hwhen related but distinct criterithe for even evaluating whether or does'nt the license qualifies a program as free software. Look at Free software license and Open source vs. free software.

Also, a Debian project has its own criteria, a Debian Free Software Guidelines, which in numbers of ways was the precursor to the Open Source Definition.

OSI approved licenses
: Academic Free License Adaptive Public License (APL) Apache Software License Apple Public Source License Artistic License Attribution Assurance Licenses BSD License Computer Associates Trusted Open Source License Common Development & Distribution License Common Public License End-User License Agreement (EULA) EU DataGrid Software system License Eclipse Public License Educational Community License Eiffel Forum License Entessa Public License Fair License Frameworx License GNU General Public License (GPL) GNU Lesser General Public License (LGPL) Historical Permission Notice and Disclaimer IBM Public License Intel Open Source License Jabber Open Source License Lucent Public License MIT License MITRE Collaborative Virtual Workspace License (CVW License) Motosoto License Mozilla Public License 1.0 (MPL) Mozilla Public License Ace.One (MPL Ace.Ace) NASA Open Source Agreement Naumen Public License NetHack General Public License Nokia Open Source License OCLC Search Public License Open Class action Line 1 text Suite License Open Software License PHP License Python License Python Software Foundation License Qt Public License (QPL) RealNetworks Public Source License Reciprocal Public License Ricoh Source Code Public License Sleepycat License Sun Industry Standards Source License (SISSL) Sun Public License (SPL) Sybase Open Watcom Public License University of Illinois/NCSA Open Source License Vovida Programs License v. I.0 W3C License wxWindows Library License X.Nett License zlib-libpng license Zope Public License

Non-OSI source licenses
Licenses which are then source-available but not OSI-Qualified include: HESSLA Solaris PGP

GNU Free Documentation License
A version of the GPL for reference material.

Open Content License
License for the Open Content Project

Open Directory Project License
The license agreement for replicating ODP data.

The Open Book Project
Open Content Licence for IDG's Open Book Project.

Open Game License
License of the Open Gaming Foundation, as drafted by Wizards of the Coast.

Free Art License
Copyleft license applied to artistic content and projects.

October Open Game License
OOGL. The purpose of this License is to make a rulebook, game manual, sourcebook, supplement, or other written role-playing game document "free" in the sense that everyone is permitted to copy and redistribute it, with or without modifying it, either commercially or noncommercially.

Creative Commons License Generator
Service allowing quick and easy selection of one of a range of Open Content licenses to meet a content creators' requirements (concerning attribution, whether commercial use is allowed, and whether modification is allowed).

kuro5hin.org: Creative Commons -NC Licenses Considered Harmful
"One particular licensing option...is a growing problem for the free content community. It is the allow non-commercial use only (-NC) option. The 'non-commercial use only' variants of the Creative Commons licenses are non-free, and in some ways worse than traditional copyright law -- because it can be harder to move away from them once people have made the choice."