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82-632: The PHP License is the open-source license under which the PHP scripting language is released. The PHP License is designed to encourage widespread adoption of the source code. Redistribution is permitted in source or binary form with or without modifications, with some caveats. Version 3 of PHP used a dual license —PHP 3's source is available under either the PHP License or the GNU General Public License (GPL). This practice

164-489: A title or a certificate of ownership. The rights to a property may be transferred from one "owner" to another. A transfer tax is a tax on the passing of title to property from one person (or entity) to another. An owner may request that, after death, private property be transferred to family members, through inheritance . In certain cases, ownership may be lost to the public interest. Private real estate may be confiscated or used for public purposes, for example, to build

246-573: A "natural right" that God had not bestowed exclusively on the monarchy: the labor theory of property . This stated that property is a natural result of labor improving upon nature; and thus by labor expenditure, the laborer becomes entitled to its produce. Influenced by the rise of mercantilism , Locke argued that private property was antecedent to and thus independent of government. Locke distinguished between "common property", by which he meant common land , and property in consumer goods and producer-goods. His chief argument for property in land ownership

328-408: A bundle is composed of a set of rights that allows the owner of the asset to control it and decide on its use, claim the value generated by it, exclude others from using it, and the right to transfer the ownership (set of rights over the asset) of it to another holder. In Marxian economics and socialist politics, a distinction is made between "private property" and " personal property ". The former

410-562: A clause requiring advertising materials to mention its use. The PHP License is an open source license according to the Open Source Initiative , and a non- copyleft free software license according to the Free Software Foundation . The license is GPL-incompatible due to restrictions on the usage of the term PHP . Debian maintainers have had a long-standing discussion (since at least 2005) about

492-524: A component of the development of a post-capitalist economic system . In response to the socialist critique, the Austrian School economist Ludwig Von Mises argued that private property rights are a requisite for what he called "rational" economic calculation and that the prices of goods and services cannot be determined accurately enough to make efficient economic calculation without having clearly defined private-property rights. Mises argued that

574-421: A copyleft base must come with the source code, and the source code must be available under the same or a similar license. This offers protection against proprietary software consuming code without giving back. Richard Stallman stated that "the central idea of copyleft is to use copyright law, but flip it over to serve the opposite of its usual purpose: instead of a means of privatizing software, [copyright] becomes

656-450: A digital equivalent where the user must click to accept. Open-source software has an additional acceptance mechanism. Without permission from the copyright holder, the law prohibits redistribution. Therefore, courts treat redistribution as acceptance of the license terms. These can include attribution provisions or source code provisions for copyleft licenses. Developers typically achieve compliance without lawsuits. Social pressures, like

738-599: A file-based definition, the CPL and EPL use a module-based definition, and the FSF's own LGPL refers to software libraries. License compatibility determines how code with different licenses can be distributed together. The goal of open-source licensing is to make the work freely available, but this becomes complicated when working with multiple terminologies imposing different requirements. There are many uncommonly used licenses and some projects write their own bespoke agreements. As

820-448: A given period. Marx's conception of private property has proven influential for many subsequent economic theories and for communist , socialist , and anarchist political movements, and led to the widespread association of private property—particularly private property in the means of production —with capitalism . Private property is a legal concept defined and enforced by a country's political system . The area of law that deals with

902-459: A license covers free and open-source software. There is significant diversity among individual licenses but little difference between the rival definitions. The three definitions each require that people receiving covered software must be able to use, modify, and redistribute the covered work. Eric S. Raymond was a proponent of the term " open source " over "free software". He viewed open source as more appealing to businesses and more reflective of

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984-436: A means of keeping software free." Free software licenses are also open-source software licenses. The separate terms free software and open-source software reflect different values rather than a legal difference. Both movements and their formal definitions require the covered work to be made available with source code and with permission for modification and redistribution. There are occasional edge cases where only one of

1066-583: A more specific and objective standard for the FOSS that Debian would host in their repositories. The OSI adopted the DSFG and used them as the basis for their Open Source Definition. The Free Software Foundation maintains a rival set of criteria, the Free Software Definition. Historically, these three organizations and their sets of criteria have been the notable authorities in determining whether

1148-424: A patent retaliation clause. Patent retaliation, or patent suspension, clauses take effect if a licensee initiates patent infringement litigation on covered code. In that situation, the patent grants are revoked. These clauses protect against patent trolling . Copyleft licenses require source code to be distributed with software and require the source code to be made available under a similar license. Like

1230-400: A result, this causes more confusion than other legal aspects. When releasing a collection of applications, each license can be considered separately. However, when attempting to combine software, code from another project can only be in-licensed if the project uses compatible terms and conditions. When combining code bases, the original licenses can be maintained for separate components, and

1312-496: A road. The legal framework of a country or society defines some of the practical implications of private property. There are no expectations that these rules will define a rational and consistent model of economics or social system. Although contemporary neoclassical economics —currently the dominant school of economics—rejects some of the assumptions of the early philosophers underpinning classical economics, it has been argued that neoclassical economics continues to be influenced by

1394-602: A similar license. Since the mid-2000s, courts in multiple countries have upheld the terms of both types of license. Software developers have filed cases as copyright infringement and as breaches of contract. Intellectual property (IP) is a legal category that treats creative output as property, comparable to private property . Legal systems grant the owner of an IP the right to restrict access in many ways. Owners can sell, lease, gift, or license their properties. Multiple types of IP law cover software including trademarks , patents , and copyrights . Most countries, including

1476-503: A social relationship in which the property owner takes possession of anything that another person or group produces with that property and capitalism depends on private property. The socialist critique of private ownership is heavily influenced by the Marxist analysis of capitalist property forms as part of its broader critique of alienation and exploitation in capitalism. Although there is considerable disagreement among socialists about

1558-424: A socialist system, which by definition would lack private property in the factors of production, would be unable to determine appropriate price valuations for the factors of production. According to Mises, this problem would make rational socialist calculation impossible. In capitalism , ownership can be viewed as a "bundle of rights" over an asset that entitles its holder to a strong form of authority over it. Such

1640-616: Is a design that identifies the distinct source of a product. Because they distinguish products, the same designs can be used in different fields where there is no risk of confusing similar sources. To give up control of a trademark would result in the loss of that trademark. Therefore, no open-source license freely offers the use of a trademark. Trademark restrictions can overlap copyrights and affect material otherwise freely available. The US Supreme Court described using trademark law to restrict public domain content as "mutant copyright". In Dastar Corp. v. Twentieth Century Fox Film Corp. ,

1722-452: Is a set of conditions under which actions otherwise restricted by IP laws are permitted. Under the bare license interpretation, advocated by the FSF, a case is brought to court by the copyright holder as copyright infringement . Under the contract interpretation, a case can be brought to court by an involved party as a breach of contract . US and French courts have tried cases under both interpretations. Non-profit organizations like FSF and

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1804-426: Is also covered by other forms of IP. Major open-source licenses written since the late 1990s contain patent grants. These open-source patent grants cover the patents held by the developers. Software patents cover ideas and, rather than a specific implementation, cover any implementation of a claim . Patent claims give the holder the right to exclude others from making, using, selling, or importing products based on

1886-412: Is another name for monopoly and can hamper allocative efficiency. Through the use of taxation and modified Vickrey auctions , they argue that partial common property ownership is a more efficient and just way to organize the economy. The justifications for private property rights have also been critiqued as tools of empire that enable land appropriation. According to academic commentator Brenna Bhandar,

1968-470: Is defined as the means of production about private ownership over an economic enterprise based on socialized production and wage labor whereas the latter is defined as consumer goods or goods produced by an individual. Prior to the 18th century, private property usually referred to land ownership . Private property in the means of production is the central element of capitalism criticized by socialists. In Marxist literature, private property refers to

2050-584: Is how they define derivative works covered by the reciprocal provisions. The GPL, and the Affero License (AGPL) based on it, use a broad scope to describe affected works. The AGPL extends the reciprocal obligation in the GPL to cover software made available over a network. They are called strong copyleft in contrast to the weaker copyleft licenses often used by corporations. Weak copyleft uses narrower, explicit definitions of derivative works. The MPL uses

2132-543: Is more comprehensive and explicit. The Apache Software Foundation wrote it for their Apache HTTP Server . Version 2, published in 2004, offers legal advantages over simple licenses and provides similar grants. While the BSD and MIT licenses offer an implicit patent grant, the Apache License includes a section on patents with an explicit grant from contributors. Additionally, it is one of the few permissive licenses with

2214-404: Is the continual process where developers can build on the derivative works of each other and combine their projects into collective works. Explicitly making covered code sublicensable provides a legal advantage when tracking the chain of authorship. The BSD and MIT are template licenses that can be adapted to any project. They are widely adapted and used by many FOSS projects. The Apache License

2296-506: Is triggered when covered code is hosted or distributed. Some developers have adopted the AGPL, and others have switched to proprietary licenses with features of open-source licensing. For example, open-core developer Elastic switched from the Apache license to the "source-available" Server Side Public License . Source-available software comes with source code as a reference. Since 2010,

2378-623: The Creative Commons CC0, provides a waiver of copyright claims into the public domain along with a permissive software license as a fallback. In jurisdictions that do not accept a public domain waiver, the permissive license takes effect. Public domain waivers share limitations with simple academic licenses. This creates the possibility that an outside party could attempt to control a public domain work via patent or trademark law. Public domain waivers handle warranties differently from any type of license. Even very permissive ones, like

2460-574: The European Court of Justice noted in the 2012 SAS Institute case that "ideas and principles which underlie [computer program] interfaces are not protected by copyright". In a similar 2021 case , the US Supreme Court permitted the recreation of an API in a transformative product under fair use . A long-debated subject within the FOSS community is whether open-source licenses are "bare licenses" or contracts . A bare license

2542-415: The GNU General Public License (GPL). Traditional, proprietary software licenses are written with the goal of increasing profit , but Stallman wrote the GPL to increase the body of available free software. His reciprocal licenses offer the rights to use, modify, and distribute the work on the condition that people must release derivative works under a license offering these same freedoms. Software built on

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2624-533: The Software Freedom Conservancy offer to hold the rights to developers' projects to enforce compliance. When a copyright expires, the work enters the public domain , and is freely available to anyone. Some creative works are not covered by copyright and enter directly into the public domain. In the early history of computing, this applied to software. Early computer software was often given away with hardware. Developed initially at MIT,

2706-446: The US and German courts rejected these claims. They ruled that the defendants could not have legally distributed the software if the licenses were unenforceable. Courts have found that distributing software indicates acceptance of the license's terms. Physical software releases can obtain the consumer's assent with notices placed on shrinkwrap . Online distribution can use clickwrap ,

2788-464: The enclosure of agricultural land in England, especially as debated in the 17th and 18th centuries, accompanied efforts in philosophy and political thought—by Thomas Hobbes (1588–1679), James Harrington (1611–1677) and John Locke (1632–1704), for example—to address the phenomenon of property ownership . In arguing against supporters of absolute monarchy , John Locke conceptualized property as

2870-433: The free software movement in response to the rise of proprietary software . The term "open source" was used by the Open Source Initiative (OSI), founded by free software developers Bruce Perens and Eric S. Raymond . "Open source" emphasizes the strengths of the open development model rather than software freedoms. While the goals behind the terms are different, open-source licenses and free software licenses describe

2952-413: The working population by their claim to ownership in the form of stock or private equity. This exploitative arrangement is perpetuated due to the structure of capitalist society. Capitalism is regarded as a class system akin to historical class systems like slavery and feudalism . Private ownership has also been criticized on non-Marxist ethical grounds by advocates of market socialism . According to

3034-462: The 1980s, he started the GNU Project to create a free operating system, wrote essays on freedom, founded the Free Software Foundation (FSF), and wrote several free software licenses. The FSF used existing intellectual property laws for the opposite of their intended goal of restriction. Instead of imposing restrictions, free software explicitly provided freedoms to the recipient. In the 90s,

3116-406: The 2004 Apache License offer explicit patent grants and limited protection from patent litigation. These patent retaliation clauses protect developers by terminating grants for any party who initiates a patent lawsuit regarding covered software. Trademarks are the only form of IP not shared by free and open-source software. Trademarks on FOSS function the same as any other trademark. A trademark

3198-572: The FSF or the OSI accept a license, but the popular free software licenses are open source, including the GPL . Practical benefits to copyleft licenses have attracted commercial developers. Corporations have used and written reciprocal licenses with a narrower scope than the GPL. For example, Netscape drafted their own copyleft terms after rejecting permissive licenses for the Mozilla project. The GPL remains

3280-427: The GPL and are said to be GPL-compatible. GPL software can only be used under the GPL or AGPL. Permissive licenses are broadly compatible because they can cover separate parts of a project. Multiple licenses including the GPL and Apache License have been revised to enhance compatibility. Translation issues, ambiguity in licensing terms, and incompatibility of some licenses with the law in certain jurisdictions compound

3362-479: The MIT license, disclaim warranty and liability. Anyone using the free software must accept this disclaimer as a condition. Because public domain content is available to everyone, the copyright waiver cannot impose a disclaimer. Open-source licenses allow other businesses to commercialize covered software. Work released under a permissive license can be incorporated into proprietary software. Permissive licenses permit

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3444-436: The OSI. Open-source licenses are categorized as copyleft or permissive . Copyleft licenses require derivative works to include source code under a similar license. Permissive licenses do not, and therefore the code can be used within proprietary software. Copyleft can be further divided into strong and weak depending on whether they define derivative works broadly or narrowly. Licenses focus on copyright law, but code

3526-546: The Persian Empire, and emerged in the Western tradition at least as far back as Plato . Before the 18th century, English speakers generally used the word "property" about land ownership . In England , "property" came to have a legal definition in the 17th century. Private property defined as property owned by commercial entities emerged with the great European trading companies of the 17th century. The issue of

3608-584: The United States (US), have created copyright laws in line with the Berne Convention . These laws assign a copyright whenever a work is released in any fixed format. Under US copyright law, the initial release is considered an original work . The creator, or their employer, holds the copyright to this original work and therefore has the exclusive right to make copies, release modified versions, distribute copies, perform publicly, or display

3690-505: The addition of new terms, including proprietary ones. Proprietary software has heavily integrated open-source code released under the Apache, BSD, and MIT licenses. Open core is a business model where developers release a core piece of software as open source and monetize a product containing it as proprietary software. The strong copyleft GPL is written to prevent distribution within proprietary software. Weak copyleft licenses impose specific requirements on derivative works that may allow

3772-454: The cloud model has grown in prominence. Developers have criticized cloud companies that profit from hosting open-source software without contributing money or code upstream, comparing the practice to strip mining . Cloud computing leader Amazon Web Services has stated they comply with licenses and act in their customers' best interests. Private property Private property is foundational to capitalism , an economic system based on

3854-748: The court "caution[ed] against misuse or over-extension of trademark" law without providing a firm decision on those mutant copyrights. Trademark overlap can leave open-source and free content projects vulnerable to a "hostile takeover" if outside parties file for trademarks on derivative works. Notably, Andrey Duskin applied for trademarks on the SCP Foundation , a collaborative writing project, when creating derivative works based on SCP stories. Permissive licenses , also known as academic licenses, allow recipients to use, modify, and distribute software with no obligation to provide source code. Institutions created these licenses to distribute their creations to

3936-439: The covered code to be distributed within proprietary software in certain circumstances. Cloud computing relies on free and open-source software and avoids the distribution that triggers most licenses. Cloud software is hosted rather than distributed. A vendor hosts the software online, and their end users do not have to download, access, or even know about the code in use. The copyleft GNU Affero General Public License (AGPL)

4018-399: The covered software. The BSD licenses brought the concept of academic freedom of ideas to computing. Early academic software authors had shared code based on implied promises. Berkeley made these concepts explicit with clear disclaimers for liability and warranty along with conditions, or clauses , for redistribution. The original had four clauses, but subsequent versions have further reduced

4100-466: The economist James Yunker, the ethical case for market socialism is that because passive property income requires no mental or physical exertion on the part of the recipient, and its appropriation by a small group of private owners is the source of the vast inequalities in contemporary capitalism, social ownership in a market economy would resolve the major cause of social inequality and its accompanying social ills. Weyl and Posner argue that private property

4182-533: The extent to which an owner will be able to exercise rights over the same. The rights to private property often come with limitations. For example, local government may enforce rules about what kind of building may be built on private land ( building code ), or whether a historical building may be demolished or not. Theft is common in many societies, and the extent to which central administration will pursue property crime varies enormously. Some forms of private property are uniquely identifiable and may be described in

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4264-411: The form of government". Smith further argued that civil government could not exist without property, as the government's main function was to define and safeguard property ownership. In the 19th century, the economist and philosopher Karl Marx (1818–1883) provided an influential analysis of the development and history of property formations and their relationship to the technical productive forces of

4346-413: The government requests that owners pay for the privilege of ownership. A property tax is an ad valorem tax on the value of a property, usually levied on real estate . The tax is levied by the governing authority of the jurisdiction in which the property is located. It may be imposed annually or at the time of a real estate transaction , such as in real estate transfer tax . Under a property-tax system,

4428-429: The government requires or performs an appraisal of the monetary value of each property, and tax is assessed in proportion to that value. The four broad types of property taxes are land , improvements to land (immovable human-made objects, such as buildings), personal property (movable human-made objects), and intangible property . The social and political context in which private property is administered will determine

4510-576: The idea. Because patents grant the right to exclude rather than the right to create, it is possible to have a patent on an idea but still be unable to legally implement it if the invention relies on another patented idea. Thus, open-source patent grants can offer permission only from covered patents. They cannot guarantee that a third party has not patented any concepts embodied in the code. The older permissive licenses do not discuss patents directly and offer only implicit patent grants in their offers to use or sell covered material. Newer copyleft licenses and

4592-517: The land will be put to productive use and its value protected by the landowner . If the owners must pay property taxes , this forces the owners to maintain a productive output from the land to keep taxes current. Private property also attaches a monetary value to land, which can be used to trade or as collateral . Private property thus is an important part of capitalization within the economy . Socialist economists are critical of private property as socialism aims to substitute private property in

4674-586: The language implemented in property legislation dictates colonized peoples as unable to effectively own and utilize their land. It is suggested that personal rights are interchangeable with property rights, therefore communities that utilize communal methods of land ownership are not equally validated by private property ideals. It is also argued by critical race theorist Cheryl Harris that race and property rights have been conflated over time, with only those qualities unique to white settlement recognized legally. Indigenous use of land, focusing on common ownership,

4756-425: The larger work released under a compatible license. This compatibility is often one-way. Public domain content can be used anywhere as there is no copyright claim, but code acquired under any almost any set of terms cannot be waved to the public domain. Permissive licenses can be used within copyleft works, but copyleft material cannot be released under a permissive license. Some weak copyleft licenses can be used under

4838-430: The legacy of natural moral theory and the concept of natural rights , which has led to the presentation of private market exchange and private property rights as "natural rights" inherent in nature. Economic liberals (defined as those who support a private sector -driven market economy) consider private property to be essential for the construction of a prosperous society. They believe private ownership of land ensures

4920-487: The license, increasing the difficulties of compliance. Free and open-source software licenses have been successfully enforced in civil court since the mid-2000s. In a pair of early lawsuits— Jacobsen v. Katzer in the United States and Welte v. Sitecom in Germany—;defendants argued that open-source licenses were invalid. Sitecom and Katzer separately argued that the licenses were unenforceable. Both

5002-447: The means of production for social ownership or public property . Socialists generally argue that private property relations limit the potential of the productive forces in the economy when the productive activity becomes a collective activity, where the role of the capitalist becomes redundant (as a passive owner). Socialists generally favor social ownership either to eliminate the class distinctions between owners and workers and as

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5084-468: The modern usage begins with Richard Stallman's efforts to create a free operating system. In 1984, programmer Don Hopkins mailed a manual to Stallman with a "Copyleft Ⓛ" sticker. Stallman, who was working on the GNU operating system, adopted the term. An early version of copyleft licensing was used for the 1985 release of GNU Emacs . The term became associated with the FSF's later reciprocal licenses, notably

5166-531: The modification and sharing of creative works. Free and open-source licenses use these existing legal structures for an inverse purpose. They grant the recipient the rights to use the software, examine the source code , modify it, and distribute the modifications. These criteria are outlined in the Open Source Definition . After 1980, the United States began to treat software as a literary work covered by copyright law. Richard Stallman founded

5248-715: The most popular license of this type, but there are other significant examples. The FSF has crafted the Lesser General Public License (LGPL) for libraries . Mozilla uses the Mozilla Public License (MPL) for their releases, including Firefox . IBM drafted the Common Public License (CPL) and later adopted the Eclipse Public License (EPL). A difference between the GPL and other reciprocal licenses

5330-470: The permissive licenses, most copyleft licenses require attribution. Most, including the GPL, disclaim implied warranties. Copyleft uses the restrictions of IP law—contrary to their usual purpose—to mandate that the code remain open. The term and it's related slogan, "All rights reversed", had been previously used in a playful manner by the Principia Discordia and Tiny BASIC ;

5412-561: The pioneering video game Spacewar! was used to market and test the PDP-1 computer. According to attorney Lawrence Rosen , copyright laws were not written with the expectation that creators would place their work into the public domain. Thus intellectual property laws lack clear paths to waive a copyright. Highly permissive licenses described as "public domain" may legally function as unilateral contracts that offer something but impose no terms. A public-domain-equivalent license , like

5494-928: The potential for community backlash, are often sufficient. Cease and desist letters are a common method to bring companies back into compliance, especially in Germany. A standard process has developed in the German legal system. FOSS developers present companies with a cease and desist letter. These letters outline how to come back into compliance from a violation. German judges can issue a court-mandated cease and desist order to unresponsive companies. Civil cases proceed if these first steps fail. The German procedural laws are clear and favorable to claimants. Uncertainties remain in how different courts will handle certain aspects of licensing. For software in general, there are debates about what can be patented and what can be copyrighted. Regarding an application programming interface (API),

5576-516: The private ownership of the means of production and their operation for profit . As a legal concept, private property is defined and enforced by a country's political system . The first evidence of private property may date back to the Babylonians in 1800 BC, as evidenced by the archeological discovery of Plimpton 322 , a clay tablet used for calculating property boundaries. However, written discussions of private property were not seen until

5658-417: The problem of license compatibility. Downloading an open-source module is straightforward, but complying with the licensing terms can be more difficult. Because of the amount of software dependencies, engineers working on complex projects often rely on license management software to achieve compliance with the licensing terms of open-source components. Many open-source software files do not unambiguously state

5740-529: The proprietary model where small pools of secretive workers carried out this work with the development of Linux where the pool of testers included potentially the entire world. He summarized this strength as "Given enough eyeballs, all bugs are shallow." The OSI succeeded in bringing open-source development to corporate developers including Sun Microsystems, IBM , Netscape, Mozilla , Apache , Apple Inc., Microsoft, and Nokia. These companies released code under existing licenses and drafted their own to be approved by

5822-545: The public. Permissive licenses are usually short, often less than a page of text. They impose few conditions . Most include disclaimers of warranty and obligations to credit authors. A few include explicit provisions for patents, trademarks, and other forms of intellectual property. The University of California, Berkeley created the first open-source license when they began distributing their Berkeley Software Distribution (BSD) operating system. The BSD license and its later variations permit modification and distribution of

5904-412: The restrictions. As a result, it's common to specify if the covered software uses a 2-clause or 3-clause version. The Massachusetts Institute of Technology (MIT) created an academic license based on the BSD original. The MIT license clarified the conditions by making them more explicit. For example, the MIT license describes the right to sublicense . One of the strengths of open-source development

5986-421: The same type of licenses. The two main categories of open-source licenses are permissive and copyleft . Both grant permission to change and distribute software. Typically, they require attribution and disclaim liability . Permissive licenses come from academia. Copyleft licenses come from the free software movement. Copyleft licenses require derivative works to be distributed with the source code and under

6068-465: The subject is called property law . The enforcement of property law concerning private property is a matter of public expense. Defence of property is a common method of justification used by defendants who argue that they should not be held liable for any loss and injury that they have caused because they were acting to protect their property . Courts have generally ruled that the use of force may be acceptable. In many political systems,

6150-532: The tangible advantages of FOSS development. One of Raymond's goals was to expand the existing hacker community to include large commercial developers. In The Cathedral and the Bazaar , Raymond compared open-source development to the bazaar , an open-air public market. He argued that aside from ethics, the open model provided advantages that proprietary software could not replicate. Raymond focused heavily on feedback , testing , and bug reports . He contrasted

6232-514: The term "open source" was coined as an alternative label for free software, and specific criteria were laid out to determine which licenses covered free and open-source software. Two active members of the free software community, Bruce Perens and Eric S. Raymond , founded the Open Source Initiative (OSI). At Debian , Perens had proposed the Debian Free Software Guidelines (DFSG). The DFSG were drafted to provide

6314-446: The validity of certain aspects of Marxist analysis, the majority of socialists are sympathetic to Marx's views on exploitation and alienation. Socialists critique the private appropriation of property income because such income does not correspond to a return on any productive activity and is generated by the working class , it represents exploitation. The property-owning (capitalist) class lives off passive property income produced by

6396-726: The validity of the PHP license. Expressed concerns include that the license "contains statements about the software it covers that are specific to distributing PHP itself", which, for other software than PHP itself therefore would be "false statements". Debian has a specific policy for the license (and requires a statement in debian/copyright file when it is used): "The PHP license must only be used for PHP and PHP add-ons." Open-source license Open-source licenses are software licenses that allow content to be used, modified, and shared. They facilitate free and open-source software (FOSS) development. Intellectual property (IP) laws restrict

6478-480: The work publicly. Modified versions of the original work are derivative works . When a creator modifies an existing work, they hold the copyright to their modifications. Unless the original work was in the public domain, a derivative work can only be distributed with the permission of every copyright holder. In 1980, the US government amended the law to treat software as a literary work. Software released after this point

6560-504: Was restricted by IP laws. At that time, American activist and programmer Richard Stallman was working as a graduate student at the MIT Computer Science and Artificial Intelligence Laboratory . Stallman witnessed fragmentation among software developers. He blamed the spread of proprietary software and closed models of development. To push back against these trends, Stallman founded the free software movement . Throughout

6642-400: Was discontinued as of PHP 4, with PHP's developers citing the restrictions on reuse associated with the GPL's copyleft enforcement as being the reason for dropping it. The Zend Engine , the core of the PHP interpreter, is separately licensed under the similar Zend Engine License, which contains similar naming restrictions to the PHP license (applying to the names "Zend" and "Zend Engine"), and

6724-655: Was that it led to improved land management and cultivation over common land. In the 18th century, during the Industrial Revolution , the moral philosopher and economist Adam Smith (1723–1790), in contrast to Locke, distinguished between the "right to property" as an acquired right, and natural rights . Smith confined natural rights to "liberty and life". Smith also drew attention to the relationship between employee and employer and identified that property and civil government were dependent upon each other, recognizing that "the state of property must always vary with

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