1.
Massachusetts Institute of Technology
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The Massachusetts Institute of Technology is a private research university in Cambridge, Massachusetts, often cited as one of the worlds most prestigious universities. Researchers worked on computers, radar, and inertial guidance during World War II, post-war defense research contributed to the rapid expansion of the faculty and campus under James Killian. The current 168-acre campus opened in 1916 and extends over 1 mile along the bank of the Charles River basin. The Institute is traditionally known for its research and education in the sciences and engineering, and more recently in biology, economics, linguistics. Air Force and 6 Fields Medalists have been affiliated with MIT, the school has a strong entrepreneurial culture, and the aggregated revenues of companies founded by MIT alumni would rank as the eleventh-largest economy in the world. In 1859, a proposal was submitted to the Massachusetts General Court to use newly filled lands in Back Bay, Boston for a Conservatory of Art and Science, but the proposal failed. A charter for the incorporation of the Massachusetts Institute of Technology, Rogers, a professor from the University of Virginia, wanted to establish an institution to address rapid scientific and technological advances. The Rogers Plan reflected the German research university model, emphasizing an independent faculty engaged in research, as well as instruction oriented around seminars, two days after the charter was issued, the first battle of the Civil War broke out. After a long delay through the war years, MITs first classes were held in the Mercantile Building in Boston in 1865, in 1863 under the same act, the Commonwealth of Massachusetts founded the Massachusetts Agricultural College, which developed as the University of Massachusetts Amherst. In 1866, the proceeds from sales went toward new buildings in the Back Bay. MIT was informally called Boston Tech, the institute adopted the European polytechnic university model and emphasized laboratory instruction from an early date. Despite chronic financial problems, the institute saw growth in the last two decades of the 19th century under President Francis Amasa Walker. Programs in electrical, chemical, marine, and sanitary engineering were introduced, new buildings were built, the curriculum drifted to a vocational emphasis, with less focus on theoretical science. The fledgling school still suffered from chronic financial shortages which diverted the attention of the MIT leadership, during these Boston Tech years, MIT faculty and alumni rebuffed Harvard University president Charles W. Eliots repeated attempts to merge MIT with Harvard Colleges Lawrence Scientific School. There would be at least six attempts to absorb MIT into Harvard, in its cramped Back Bay location, MIT could not afford to expand its overcrowded facilities, driving a desperate search for a new campus and funding. Eventually the MIT Corporation approved an agreement to merge with Harvard, over the vehement objections of MIT faculty, students. However, a 1917 decision by the Massachusetts Supreme Judicial Court effectively put an end to the merger scheme, the neoclassical New Technology campus was designed by William W. Bosworth and had been funded largely by anonymous donations from a mysterious Mr. Smith, starting in 1912. In January 1920, the donor was revealed to be the industrialist George Eastman of Rochester, New York, who had invented methods of production and processing
2.
Publishing
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Publishing is the dissemination of literature, music, or information—the activity of making information available to the general public. In some cases, authors may be their own publishers, meaning originators and developers of content also provide media to deliver, also, the word publisher can refer to the individual who leads a publishing company or an imprint or to a person who owns/heads a magazine. Traditionally, the term refers to the distribution of printed works such as books, Publishing includes the following stages of development, acquisition, copy editing, production, printing, and marketing and distribution. There are two categories of book publisher, Non-paid publishers, A non-paid publisher is a house that does not charge authors at all to publish their books. Paid publishers, The author has to meet with the expense to get the book published. This is also known as vanity publishing, at a small press, it is possible to survive by relying entirely on commissioned material. But as activity increases, the need for works may outstrip the publishers established circle of writers, for works written independently of the publisher, writers often first submit a query letter or proposal directly to a literary agent or to a publisher. Submissions sent directly to a publisher are referred to as unsolicited submissions, the acquisitions editors send their choices to the editorial staff. Unsolicited submissions have a low rate of acceptance, with some sources estimating that publishers ultimately choose about three out of every ten thousand unsolicited manuscripts they receive. Many book publishers around the world maintain a strict no unsolicited submissions policy and this policy shifts the burden of assessing and developing writers out of the publisher and onto the literary agents. At these publishers, unsolicited manuscripts are thrown out, or sometimes returned, established authors may be represented by a literary agent to market their work to publishers and negotiate contracts. Literary agents take a percentage of earnings to pay for their services. Some writers follow a route to publication. Such books often employ the services of a ghostwriter, for a submission to reach publication, it must be championed by an editor or publisher who must work to convince other staff of the need to publish a particular title. An editor who discovers or champions a book that becomes a best-seller may find their reputation enhanced as a result of their success. Once a work is accepted, commissioning editors negotiate the purchase of property rights. The authors of traditional printed materials typically sell exclusive territorial intellectual property rights that match the list of countries in which distribution is proposed. In the case of books, the publisher and writer must also agree on the formats of publication —mass-market paperback
3.
GNU General Public License
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The GNU General Public License is a widely used free software license, which guarantees end users the freedom to run, study, share and modify the software. The license was written by Richard Stallman of the Free Software Foundation for the GNU Project. The GPL is a license, which means that derivative work can only be distributed under the same license terms. This is in distinction to permissive free licenses, of which the BSD licenses. GPL was the first copyleft license for general use, historically, the GPL license family has been one of the most popular software licenses in the free and open-source software domain. Prominent free software licensed under the GPL include the Linux kernel. In 2007, the version of the license was released to address some perceived problems with the second version that were discovered during its long-time usage. To keep the license up to date, the GPL license includes an optional any later version clause, developers can omit it when licensing their software, for instance the Linux kernel is licensed under GPLv2 without the any later version clause. The GPL was written by Richard Stallman in 1989, for use with programs released as part of the GNU project, the original GPL was based on a unification of similar licenses used for early versions of GNU Emacs, the GNU Debugger and the GNU C Compiler. These licenses contained similar provisions to the modern GPL, but were specific to each program, rendering them incompatible, Stallmans goal was to produce one license that could be used for any project, thus making it possible for many projects to share code. The second version of the license, version 2, was released in 1991, version 3 was developed to attempt to address these concerns and was officially released on 29 June 2007. Version 1 of the GNU GPL, released on 25 February 1989, the first problem was that distributors may publish binary files only—executable, but not readable or modifiable by humans. To prevent this, GPLv1 stated that any vendor distributing binaries must also make the source code available under the same licensing terms. The second problem was that distributors might add restrictions, either to the license, the union of two sets of restrictions would apply to the combined work, thus adding unacceptable restrictions. To prevent this, GPLv1 stated that modified versions, as a whole, had to be distributed under the terms in GPLv1. Therefore, software distributed under the terms of GPLv1 could be combined with software under more permissive terms, according to Richard Stallman, the major change in GPLv2 was the Liberty or Death clause, as he calls it – Section 7. The section says that licensees may distribute a GPL-covered work only if they can all of the licenses obligations. In other words, the obligations of the license may not be severed due to conflicting obligations and this provision is intended to discourage any party from using a patent infringement claim or other litigation to impair users freedom under the license
4.
Theo de Raadt
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Theo de Raadt is a software engineer who lives in Calgary, Alberta, Canada. He is the founder and leader of the OpenBSD and OpenSSH projects, Theo de Raadt is the eldest of four children to a Dutch father and a South African mother, with two sisters and a brother. Concern over the mandatory two-year armed forces conscription in South Africa led the family to emigrate to Calgary, Alberta, in 1983, the largest recession in Canada since the Great Depression sent the family to the Yukon. Prior to the move De Raadt got his first computer, a Commodore VIC-20 and it is with these computers that he first began to develop software. In 1992 he obtained a BSc in Computer Science from the University of Calgary, the new project would centre its focus on clean, portable, correct code with the goal being to produce a unified, multi-platform, production-quality, BSD-based operating system. Because of the importance of such as the Internet in the distributed, collaborative nature of its development, De Raadt suggested the name NetBSD. The first NetBSD source code repository was established on March 21,1993 and this was derived from 386BSD0.1 plus the version 0.2.2 unofficial patchkit, with several programs from the Net/2 release missing from 386BSD re-integrated, and various other improvements. In August 1993, NetBSD0.9 was released, which contained many enhancements and this was still a PC-platform-only release, although by this time work was underway to add support for other architectures. NetBSD1.0 was released in October,1994 and this was the first multi-platform release, supporting the IBM PC compatible, HP9000 Series 300, Amiga, 68k Macintosh, Sun-4c series and PC532. Also in this release, the legally encumbered Net/2-derived source code was replaced with equivalent code from 4. 4BSD-lite, De Raadt played a vital role in the creation of the SPARC port, as together with Chuck Cranor, he implemented much of the initial code. In December 1994, De Raadt was asked to resign his position as a developer and member of the NetBSD core team. The reason for this is not wholly clear, although there are claims that it was due to personality clashes within the NetBSD project, in October 1995, De Raadt founded OpenBSD, a new project forked from NetBSD1.0. The initial release, OpenBSD1.2, was made in July 1996, since then, the project has followed a schedule of a release every six months, each of which is maintained and supported for one year. S. AUUG Conference in Melbourne, Australia and FISL in Porto Alegre, RS, after De Raadt stated his disapproval of the U. S. Funding from the grant had been used in the development of OpenSSH and OpenBSD and this resulted in criticism among some that the US military held an anti-free speech attitude. The grant termination was, however, not as bad a blow as some portrayed it, the projects supporters rallied to help and the hackathon went on almost as planned. The funding was cut mere months before the end of the grant, De Raadt is also well known for his advocacy of free software drivers. He has long been critical of developers of Linux and other platforms for their tolerance of non-free drivers
5.
X Window System
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The X Window System is a windowing system for bitmap displays, common on UNIX-like computer operating systems. X provides the framework for a GUI environment, drawing and moving windows on the display device and interacting with a mouse. X does not mandate the user interface – this is handled by individual programs, as such, the visual styling of X-based environments varies greatly, different programs may present radically different interfaces. X originated at the Massachusetts Institute of Technology in 1984, the protocol has been version 11 since September 1987. The X. Org Foundation leads the X project, with the current reference implementation, X. Org Server, available as free and open source software under the MIT License, X is an architecture-independent system for remote graphical user interfaces and input device capabilities. Each person using a terminal has the ability to interact with the display with any type of user input device. X provides the framework, or primitives, for building such GUI environments, drawing and moving windows on the display and interacting with a mouse. X does not mandate the user interface, individual client programs handle this, programs may use Xs graphical abilities with no user interface. As such, the styling of X-based environments varies greatly. Unlike most earlier display protocols, X was specifically designed to be used over network connections rather than on an integral or attached display device. X features network transparency, which means an X program running on a computer somewhere on a network can display its user interface on an X server running on other computer on the network. The fact that the server is applied to the software in front of the user is often surprising to users accustomed to their programs being clients to services on remote computers. Xs network protocol is based on X command primitives and this approach allows both 2D and 3D operations by an X client application which might be running on a different computer to still be fully accelerated on the X servers display. X provides no support for audio, several projects exist to fill this niche. X uses a model, an X server communicates with various client programs. The server accepts requests for graphical output and sends back user input, a client and server can even communicate securely over the Internet by tunneling the connection over an encrypted network session. An X client itself may emulate an X server by providing services to other clients. This is known as X nesting, open-source clients such as Xnest and Xephyr support such X nesting
6.
OpenBSD
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OpenBSD is a free and open source Unix-like computer operating system descended from Berkeley Software Distribution, a Research Unix derivative developed at the University of California, Berkeley. In late 1995, Theo de Raadt forked it from NetBSD, besides the operating system as a whole, the project maintains portable versions of many subsystems, most notably OpenSSH, which are available as packages in other operating systems. The project is known for its developers insistence on open-source code, good documentation, code correctness and it has strict policies on licensing, preferring the ISC license and other variants of the Simplified BSD License. Many of its security features are optional or absent in other operating systems and its developers frequently audit the source tree for software bugs and security holes. De Raadt coordinates the project from his home in Calgary, Alberta and its logo and mascot is a pufferfish named Puffy. In December 1994, NetBSD co-founder Theo de Raadt was asked to resign from his position as a developer and member of the NetBSD core team. The reason for this is not wholly clear, although there are claims that it was due to personality clashes within the NetBSD project, in October 1995, de Raadt founded OpenBSD, a new project forked from NetBSD1.0. The initial release, OpenBSD1.2, was made in July 1996, since then, the project has followed a schedule of a release every six months, each of which is supported for one year. Just how widely OpenBSD is used is hard to determine as its developers do not publish or collect usage statistics. OpenBSDs security enhancements, built-in cryptography, and the pf packet filter suit it for use in the security industry, such as on firewalls, intrusion-detection systems, and VPN gateways. Proprietary systems from several manufacturers are based on OpenBSD, including devices from Armorlogic, Calyptix Security, GeNUA, RTMX, later versions of Microsofts Services for UNIX, an extension to the Windows operating system providing Unix-like functionality, use large amounts of OpenBSD code. OpenBSD ships with the X Window System and is suitable for use on the desktop, packages are available for popular applications, including desktop environments such as GNOME, KDE, and Xfce, and web browsers such as Firefox and Chromium. The project also includes three window managers in the distribution, cwm, FVWM, and twm. OpenBSD used to include a fork of Apache 1.3, in the 5.6 release, Nginx was replaced with httpd, an HTTP server with FastCGI and Transport Layer Security support. As of May 2016, Apache and Nginx are still available as ports, development is continuous, and team management is open and tiered. Snapshot releases are available at frequent intervals. Maintenance patches for supported releases may be applied manually or by updating the system against the branch of the CVS repository for that release. The standard OpenBSD kernel, as maintained by the project, is recommended for end users
7.
Node.js
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Node. js is an open-source, cross-platform JavaScript runtime environment for developing a diverse variety of server tools and applications. Although Node. js is not a JavaScript framework, many of its modules are written in JavaScript. The runtime environment interprets JavaScript using Googles V8 JavaScript engine, Node. js has an event-driven architecture capable of asynchronous I/O. These design choices aim to optimize throughput and scalability in Web applications with many input/output operations, the Node. js distributed development project, governed by the Node. js Foundation, is facilitated by the Linux Foundations Collaborative Projects program. Corporate users of Node. js software include GoDaddy, Groupon, IBM, LinkedIn, Microsoft, Netflix, PayPal, Rakuten, SAP, Voxer, Walmart, Yahoo. Node. js was originally written in 2009 by Ryan Dahl. The initial release supported only Linux and Mac OSX and its development and maintenance was led by Dahl and later sponsored by Joyent. Dahl was inspired to create Node. js after seeing a file upload progress bar on Flickr, the browser did not know how much of the file had been uploaded and had to query the Web server. Dahl demonstrated the project at the inaugural European JSConf on November 8,2009, Node. js combined Googles V8 JavaScript engine, an event loop and a low-level I/O API. The project received a standing ovation, in January 2010, a package manager was introduced for the Node. js environment called npm. The package manager makes it easier for programmers to publish and share code of Node. js libraries and is designed to simplify installation, updating. In June 2011, Microsoft and Joyent implemented a native Windows version of Node. js, the first Node. js build supporting Windows was released in July 2011. In January 2012, Dahl stepped aside, promoting coworker and npm creator Isaac Schlueter to manage the project, in January 2014, Schlueter announced that Timothy J. Fontaine would lead the project. In December 2014, Fedor Indutny started io. js, a fork of Node. js, due to the internal conflict over Joyents governance, io. js was created as an open governance alternative with a separate technical committee. Unlike Node. js, the authors planned to keep io. js up-to-date with the latest releases of the Google V8 JavaScript engine, in February 2015, the intent to form a neutral Node. js Foundation was announced. By June 2015, the Node. js and io. js communities voted to work together under the Node. js Foundation, in September 2015, Node. js v0.12 and io. js v3.3 were merged back together into Node v4.0. This brought V8 ES6 features into Node. js, and a long-term support release cycle, as of 2016, the io. js website recommends that developers switch back to Node. js and that no further releases of io. js are planned due to the merger. Node. js allows the creation of Web servers and networking tools using JavaScript, modules are provided for file system I/O, networking, binary data, cryptography functions, data streams and other core functions. Node. jss modules use an API designed to reduce the complexity of writing server applications, Node. js applications can run on Linux, macOS, Microsoft Windows, NonStop, and Unix servers
8.
Berne Convention
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The Berne Convention formally mandated several aspects of modern copyright law, it introduced the concept that a copyright exists the moment a work is fixed, rather than requiring registration. It also enforces a requirement that countries recognize copyrights held by the citizens of all parties to the convention. The Berne Convention requires its parties to treat the copyright of works of authors from other parties to the convention at least as well as those of its own nationals. For example, French copyright law applies to anything published or performed in France, Copyright under the Berne Convention must be automatic, it is prohibited to require formal registration. However, when the United States joined the Convention 1 March 1989, it continued to make statutory damages and attorneys fees only available for registered works. Under Article 4, it applies to cinematic works by persons who have their headquarters or habitual residence in a party country. The Convention relies on the concept of country of origin, often determining the country of origin is straightforward, when a work is published in a party country and nowhere else, this is the country of origin. However, under Article 5, when a work is published simultaneously in several party countries, for works simultaneously published in a party country and one or more non-parties, the party country is the country of origin. For unpublished works or works first published in a non-party country, in the Internet age, unrestricted publication online may be considered publication in every sufficiently internet-connected jurisdiction in the world. It is not clear what this may mean for determining country of origin, however other U. S. courts in similar situations have reached different conclusions, e. g. Håkan Moberg v. 33T LLC. The matter of determining the country of origin for digital publication remains a topic of controversy among law academics as well, countries under the older revisions of the treaty may choose to provide their own protection terms, and certain types of works may be provided shorter terms. If the author is unknown, because for example the author was deliberately anonymous or worked under a pseudonym, however, if the identity of the author becomes known, the copyright term for known authors applies. e. An author is not entitled a longer copyright abroad than at home. This is commonly known as the rule of the shorter term, not all countries have accepted this rule. As to works, protection must include every production in the literary, scientific and artistic domain, the Berne Convention authorizes countries to allow fair uses of copyrighted works in other publications or broadcasts. Implementations of this part of the treaty fall into the categories of fair use. This language may mean that Internet service providers are not liable for the communications of their users. Critics claim that the convention does not mention any other rights of consumers of works except for fair use, there is a legal debate about whether the U. S
9.
Free Software Foundation
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The FSF was incorporated in Massachusetts, USA, where it is also based. From its founding until the mid-1990s, FSFs funds were used to employ software developers to write free software for the GNU Project. Since the mid-1990s, the FSFs employees and volunteers have worked on legal and structural issues for the free software movement. Consistent with its goals, the FSF aims to use free software on its own computers. The Free Software Foundation was founded in 1985 as a non-profit corporation supporting free software development and it continued existing GNU projects such as the sale of manuals and tapes, and employed developers of the free software system. Since then, it has continued these activities, as well as advocating for the free software movement, the FSF is also the steward of several free software licenses, meaning it publishes them and has the ability to make revisions as needed. The FSF holds the copyrights on many pieces of the GNU system, as holder of these copyrights, it has the authority to enforce the copyleft requirements of the GNU General Public License when copyright infringement occurs on that software. From 1991 until 2001, GPL enforcement was done informally, usually by Stallman himself, often with assistance from FSFs lawyer, typically, GPL violations during this time were cleared up by short email exchanges between Stallman and the violator. In the interest of promoting copyleft assertiveness by software companies to the level that the FSF was already doing, in 2004 Harald Welte launched gpl-violations. org. In late 2001, Bradley M. Kuhn, with the assistance of Moglen, David Turner, from 2002-2004, high-profile GPL enforcement cases, such as those against Linksys and OpenTV, became frequent. GPL enforcement and educational campaigns on GPL compliance was a focus of the FSFs efforts during this period. In March 2003, SCO filed suit against IBM alleging that IBMs contributions to free software, including FSFs GNU. While FSF was never a party to the lawsuit, FSF was subpoenaed on November 5,2003, during 2003 and 2004, FSF put substantial advocacy effort into responding to the lawsuit and quelling its negative impact on the adoption and promotion of free software. From 2003 to 2005, FSF held legal seminars to explain the GPL, usually taught by Bradley M. Kuhn and Daniel Ravicher, these seminars offered CLE credit and were the first effort to give formal legal education on the GPL. In 2007, the FSF published the version of the GNU General Public License after significant outside input. In December 2008, FSF filed a lawsuit against Cisco for using GPL-licensed components shipped with Linksys products, Cisco was notified of the licensing issue in 2003 but Cisco repeatedly disregarded its obligations under the GPL. The GNU project The original purpose of the FSF was to promote the ideals of free software, the organization developed the GNU operating system as an example of this. GNU licenses The GNU General Public License is a widely used license for software projects
10.
GitHub
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GitHub is a web-based Git or version control repository and Internet hosting service. It offers all of the version control and source code management functionality of Git as well as adding its own features. It provides access control and several features such as bug tracking, feature requests, task management. GitHub offers both plans for private and free repositories on the account which are commonly used to host open-source software projects. As of April 2016, GitHub reports having more than 14 million users and more than 85.5 million repositories, the trademark mascot of GitHub is Octocat, an anthropomorphized cat with cephalopod limbs. Development of the GitHub platform began on 1 October 2007, the site was launched in April 2008 by Tom Preston-Werner, Chris Wanstrath, and PJ Hyett after it had been made available for a few months prior as a beta release. Projects on GitHub can be accessed and manipulated using the standard Git command-line interface, GitHub also allows registered and non-registered users to browse public repositories on the site. Multiple desktop clients and Git plugins have also created by GitHub. The site provides social networking-like functions such as feeds, followers, wikis, a user must create an account in order to contribute content to the site, but public repositories can be browsed and downloaded by anyone. With a registered account, users are able to discuss, manage, create repositories, submit contributions to others repositories. The software that runs GitHub was written using Ruby on Rails and Erlang by GitHub, Inc. developers Chris Wanstrath, PJ Hyett, GitHub is mostly used for code. Emojis GitHub Pages, small websites can be hosted from public repositories on GitHub, nested task-lists within files Visualization of geospatial data 3D render files that can be previewed using a new integrated STL file viewer that displays the files on a 3D canvas. The viewer is powered by WebGL and Three. js, photoshops native PSD format can be previewed and compared to previous versions of the same file. GitHubs Terms of Service do not require public software projects hosted on GitHub to meet the Open Source Definition. For that reason, it is advisable for users and developers intending to use a piece of software found on GitHub to read the license in the repository to determine if it meets their needs. The Terms of Service state, By setting your repositories to be viewed publicly, you agree to allow others to view, GitHub also operates other services, a pastebin-style site called Gist that is for hosting code snippets, and a slide hosting service called Speaker Deck. Tom Preston-Werner presented the then-new Gist feature at a punk rock Ruby conference in 2008, Gist builds on the traditional simple concept of a pastebin by adding version control for code snippets, easy forking, and SSL encryption for private pastes. Because each gist has its own Git repository, multiple code snippets can be contained in a single paste, further, forked code can be pushed back to the original author in the form of a patch, so gists can become more like mini-projects
11.
GNU Project
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The GNU Project /ɡnuː/ is a free-software, mass-collaboration project, first announced on September 27,1983 by Richard Stallman at MIT. GNU software guarantees these freedom-rights legally, and is free software. In order to ensure that the software of a computer grants its users all freedom rights, even the most fundamental and important part. Stallman decided to call this operating system GNU, basing its design on that of Unix, development was initiated in January 1984. In 1991, the kernel Linux appeared, developed outside of the GNU project by Linus Torvalds, combined with the operating system utilities already developed by the GNU project, it allowed for the first operating system that was free software, known as Linux or GNU/Linux. The projects current work includes development, awareness building, political campaigning and sharing of the new material. Richard Stallman announced his intent to start coding the GNU Project in a Usenet message in September 1983, when the GNU project first started they had an Emacs text editor with Lisp for writing editor commands, a source level debugger, a yacc-compatible parser generator, and a linker. The GNU system required its own C compiler and tools to be free software, by June 1987, the project had accumulated and developed free software for an assembler, an almost finished portable optimizing C compiler, an editor, and various Unix utilities. They had a kernel that needed more updates. Once the kernel and the compiler were finished, GNU was able to be used for program development, the main goal was to create many other applications to be like the Unix system. GNU was able to run Unix programs but was not identical to it, GNU incorporated longer file names, file version numbers, and a crashproof file system. The GNU Manifesto was written to support and participation from others for the project. Programmers were encouraged to take part in any aspect of the project that interested them, people could donate funds, computer parts, or even their own time to write code and programs for the project. The origins and development of most aspects of the GNU Project are shared in a narrative in the Emacs help system. It is the detailed history as at their web site. The GNU Manifesto was written by Richard Stallman to gain support, to implement these freedoms, users needed full access to code. Although most of the GNU Projects output is technical in nature, it was launched as a social, ethical, as well as producing software and licenses, the GNU Project has published a number of writings, the majority of which were authored by Richard Stallman. The GNU project uses software that is free for users to copy, edit and it is free in the sense that users can change the software to fit individual needs
