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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

BSD: FreeBSD Copyright
License for FreeBSD operating system.

Open Source Software Licensing Page
Some very interesting articles on free software licensing: history, forms, and problems, seen from a commercial view. Links to some license texts and important open source sites.

Aladdin Free Public License (AFPL)
For Ghostscript, by Aladdin Enterprises.

Apple/Disney: Squeak license
Project and license ran unchanged and uninterrupted even during transition to different corporation.

BSD: 4.4BSD Copyright
License for 4.4BSD.

BSD: NetBSD Licensing and Redistribution
License patterned after FreeBSD Copyright.

BSD: OpenBSD Copyright Policy
License and background on Berkeley Computer Systems Research Group copyrights.

Netscape: Mozilla Public License (MozPL) version 1.0
Follows the Debian Free Software guidelines.

OpenSource.org: Open Source Definition
Not a license itself, but a definition of what conditions a license must fulfill in order to be termed an Open Source license.

Eiffel: ISE Free Eiffel Library License (IFELL)
For the EiffelBase library.