GNU General Public LICENSE version 2 (GPLv2) Copyright (C). 1989, 1991 Free The GNU General Public License is a free, copyleft license for software and 

2018-12-15

The “left” in “copyleft” is not a reference to the verb “to leave”—only to the direction which is the mirror image of “right”. The GPLv2 is, no doubt, a good and useful license. However, unlike GPLv1 before it, GPLv2 remains an integral part of the copyleft licensing infrastructure. As such, those who seek to have expertise in current topics of copyleft licensing need to study both the GPLv2 and GPLv3 family of licenses. Under GPLv2 § 3, binary versions may be created and distributed under the terms of GPLv2 § 1–2, so all the material previously discussed applies here. However, GPLv2 § 3 must go a bit further.

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However, GPLv2 § 3 must go a bit further. Access to the software’s source code is an incontestable prerequisite for the exercise of the fundamental freedoms to modify and improve the software. Copyleft advocates have always contemplated that some companies will choose to ship proprietary software on the same device as the GPL'd works. Indeed, GPLv2 foresaw this possibility and permits that “mere aggregation” — as long as compliance is achieved for the GPLv2-covered works included on the device. In contrast, a GPLv2 licensee, under the doctrine of implied patent license, is free to practice any patent claims held by the licensor that cover “reasonably contemplated uses” of the GPL’d code, which may very well include creation and distribution of modified works since the GPL’s terms, under which the patented code is distributed, expressly permits such activity. Despite efforts by copyleft advocates to explain this in GPLv2 itself and in other documents, there are evidently some people who still believe that GPLv2 allows charging for services but not for selling copies of software and/or that the GPL requires downloads to be gratis. GNU GPLv2 The GNU GPL is the most widely used free software license and has a strong copyleft requirement.

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GPLv3 of June 29, 2007 contains the basic intent of GPLv2 and is an Open Source license with a strict copyleft (→ What types of licenses are there for Open Source software, and how do they differ? ) However, the language of the license text was strongly amended and is much more comprehensive in response to technical and legal changes and international license exchange. This is a free and copyleft license meant for artistic works.

Free Software Foundation omfattar copyleft för att skydda de fyra friheterna som listas ovan. Detta förhindrar rättsligt att människor omfördelar fri programvara 

1 The copyright holders have the right to relicense the same work under different licenses (see Section 12.2 of this tutorial), or to stop distributing the GPLv2’d version (assuming GPLv2 § 3(b) was never used), but they may not revoke the rights under GPLv2 … The Affero General Public License (Affero GPL and informally Affero License) is a free software license.The first version of the Affero General Public License (AGPLv1), was published by Affero, Inc. in March 2002, and based on the GNU General Public License, version 2 (GPLv2).The second version (AGPLv2) was published in November 2007, as a transitional license to allow an upgrade path from OSS] (discussing GPLv2 copyleft). 282 Michigan State Law Review [Vol. 2008:279 determination and freedom with one’s computer.9 The FSF’s progenitor, Richard Stallman, implemented these novel licensing concepts in GPLv2 toward his greater end of software freedom.

Like GPLv2, copyleft-next requires distribution of derivative works ("Derived Works" in copyleft-next 0.3.x) to be under the same license. Ordinarily this would make the two licenses incompatible. However, copyleft-next 0.3.1 says: "If the Derived Work includes material licensed under the GPL, You may instead license the Derived Work under the Spring] Claiming Copyleft in Open Source Software 281 Nearly two decades later, at the time of this Article’s publication, pat-ent law has changed. The U.S. Patent and Trademark Office (PTO) regu- 2018-01-24 · The "mere aggregation" clause in GPLv2 (as well as its counterpart GPLv3 provision on "aggregates") shows that this type of combination is generally acceptable, is specifically contemplated under the GPL, and has no effect on the licensing of the two programs, assuming incompatibly licensed components are separate and independent.
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The GPLV2 is the predecessor of the GPLV3 which makes the GPLV3 the newest version. The GPLV2 was introduced in 1991 while the GPLV3 was launched in 2007.

The GPL invokes its control as a copyright license over the modification of the work in combination with its control over distribution of the work. Since the GPL has no provision allowing the copyright holder to take such a prerogative, the license is granted as long as the copyright remains in effect. 1 The copyright holders have the right to relicense the same work under different licenses (see Section 12.2 of this tutorial), or to stop distributing the GPLv2’d version (assuming GPLv2 § 3(b) was never used), but they may not revoke the rights under GPLv2 … The Affero General Public License (Affero GPL and informally Affero License) is a free software license.The first version of the Affero General Public License (AGPLv1), was published by Affero, Inc. in March 2002, and based on the GNU General Public License, version 2 (GPLv2).The second version (AGPLv2) was published in November 2007, as a transitional license to allow an upgrade path from OSS] (discussing GPLv2 copyleft). 282 Michigan State Law Review [Vol.
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netfilter/iptables is - like all of the Linux Kernel - Free Software (sometimes referred to as Open Source Software), distributed under the terms of the GNU GPLv2 only. Please, note that some source code files might differ, and in that case it is explicitely stated in the header of every file.

Lessig L (2004) Free Culture. How big media uses technology and the law to lock down culture and  GPL-kompatibel. Copyleft.