Unless otherwise specified, compatible licenses are compatible with both gplv2 and gplv3. Busybox is licensed under the gnu general public license version 2, which is often abbreviated as gplv2. Back in 2016, we wrote one of our most popular posts covering 12 popular software defined radios or sdrs. Sep 05, 2018 software licensing describes the legal rights pertaining to the authorized use of digital material. A permissive software license, sometimes also called bsdlike or bsdstyle license, is a free software license with minimal requirements about how the software can be redistributed. The gnu general public license gpl is a free, copyleft license used primarily for software. There are two important terms of the gpl that are required for proper usage. Gnu general public license v3 gpl3 explained in plain english. Describes the ability to place warranty on the software licensed.
The gnu free documentation license gnu fdl or simply gfdl is a copyleft license for free documentation, designed by the free software foundation fsf for the gnu project. Frequently asked questions about the gnu licenses gnu project. Gpl is provided through the free software foundation, a nonprofit corporation that works to provide free software for the gnu project. Usrp hardware driver uhd ettus research ettus research. Millions of people around the worldincluding entire governmentsare now using free software on their computers. You can support our efforts by making a donation to the fsf. Failure to adhere to software license agreement terms often incurs criminal charges related to licensed intellectual property ip and ed material. A primer on open source software for business people and lawyers. The license allows developers and companies to use and integrate a software component released under the lgpl into their own even proprietary software without being required by the terms of a strong copyleft license to release the source code of their own components. The most significant effect of this form of licensing is that, if ownership of the software remains with the software publisher, then the enduser must accept the software license. We have designed this license in order to use it for manuals for free software, because free software needs free documentation. Prefixes may be used to indicate the number of licenses used, e. Gqrx is a software defined radio receiver powered by gnu radio and the qt gui toolkit.
Hence, no personal data is collected and gdpr compliance is met. Rfnoc is publicly offered under the gnu lesser general public license lgpl. Whats the difference between open source software and. Also called gpl and gnu gpl, it was created to distribute the software of the gnu. Gqrx is an open source software defined radio receiver sdr powered by the gnu radio and the qt graphical toolkit gqrx supports many of the sdr hardware available, including airspy, funcube dongles, rtlsdr, hackrf and usrp devices. Licensesgnu gpl 2 definition of free cultural works.
In addition to allowing you to inspect, modify, and redistribute the software, the gplv3 and lgpl also enable you to use uhd and rfnoc with popular gpl licensed design workflows such as gnu radio. Busybox is licensed under the gnu general public license. It is widely used in hobbyist, academic, and commercial. Free and open source licenses include free software with no monetary usage charge, but. Software defined radio with hackrf great scott gadgets. This is a comparison of free and opensource software licenses. This is the same license the linux kernel is under, so you may be somewhat familiar with it by now. Gpl requires any other project or source that is using the project under gpl to also be licensed as gpl however, gpl licensed code cant be used for paid and proprietary software.
The library refers to a covered work governed by this license, other than an application or a combined work as defined. The comparison only covers software licenses with a linked article for details, approved by at least one expert group at the fsf, the osi, the debian project or the fedora project. To make it free software, you need to release it under a free software license. Comparison of free and opensource software licenses. We classify a license according to certain key criteria. For a list of licenses not specifically intended for software, see list of free content licenses. Uhd is publicly offered under the gnu general public license version 3 gplv3. Open source licenses are licenses that comply with the open source definition in brief, they allow software to be freely used, modified, and shared. As interest in sdr grows unabated and we continue to see ever more affordable hardware platforms, i thought it would be timely to roundup just a few of the things that it can be used for. Have a question about free software licensing not answered here. Today, free software is available for just about any task you can imagine. This might mean that the holder allows you to use their software in your closedsourceproprietary program in exchange for money e. Meanwhile, the gnu project has been formed to develop those tools, and when those two parts were combined, a free alternative to unix was available. We, the free software foundation, use the gnu general public license for most of our software.
Gqrx sdr open source software defined radio by alexandru. It is being designed and developed by a group of sdr enthusiasts with representation from interested experimenters worldwide. It can be used with external rf hardware to create software defined radios, or without hardware in a simulationlike environment. Software defined radio sdr refers to the process of creating software that performs radio functionality that normally would be implemented in hardware. Im interested in using some gnu licensed software to help my employer attract clients. The gnu general public license gnu, gpl, or gpl is a free software license originally written by richard stallman of the free software foundation, which guarantees that users are free to use, share, and modify the software without paying anyone for it. Gnu is composed wholly of free software, most of which is licensed under the gnu projects own general public license gnu is a recursive acronym for gnu s not unix. Short for general public license, the license that accompanies some open source software that details how the software and its accompany source code can be. Software defined radio transceiver project is written in python while using gnu radio and usrp. Apr 12, 2018 this grants fewer right to work than gnu gpl. Download gqrx software defined radio receiver for free.
The hpsdr is an open source gnu type hardware and software project intended as a next generation software defined radio sdr for use by radio amateurs hams and short wave listeners swls. It is a copyleft license, meaning that any code derived from gpl licensed code must also be licensed under the gpl. As used herein, this license refers to version 3 of the gnu lesser general public license, and the gnu gpl refers to version 3 of the gnu general public license. Designed for the commercial, government, amateur radio and shortwave listener communities, this software provides a powerful interface for all sdr users. Image transfer and software defined radio using usrp and. Any software author may use the gpl to legally control the way their software may be used by others. Jun 29, 2007 the gnu general public license is a free, copyleft license for software and other kinds of works. Whats the difference between open source software and free. Can gnu licensed software be used for commercial gain without. See our other licensing resources, and if necessary contact the. In addition, the clause presented a legal problem for those wishing to publish bsd licensed software which relies upon separate programs using the gnu gpl.
The licenses were originally written by richard stallman, former head of the free software foundation fsf, for the gnu project, and grant the recipients of a computer program the rights of the free software. Examples include the gnu allpermissive license, mit license, bsd licenses, apple public source license and apache license. While the previous post still holds some extremely valuable information, a lot has changed in 3 years. Unless otherwise stated, all originally authored software on this site is licensed under the terms of gnu gpl version 3.
Software defined radio with hackrf this ongoing video series will be a complete course in software defined radio sdr. The goal is to create a software hf transceiver with various modes. Multilicensing is the practice of distributing software under two or more different sets of terms and conditions. Originally known as the gnu library general public license, it was drafted by the free software foundation fsf to provide a weaker or lesser form of copyleft for use in certain specific circumstances. The gnu general public license gnu gpl or gpl is a series of widely used free software licenses that guarantee end users the freedom to run, study, share, and modify the software. Both terms refer to essentially the same set of licenses and software, and.
Software defined radio receiver powered by gnu radio and qt. As dual licensed software, uhd is available under the opensource gnu general public license version 3 gplv3, as well as an alternative, lessrestrictive license available only from national instruments for volume oem customers deploying ettus hardware. As of 2016, the most popular free software license is the permissive mit license. See the download page for other maintained versions. I know selling said software to other parties as my own is obviously against the rules, but what about simply using it in a commercial application and making commercial gain with its use. The gnu lesser general public license lgpl is a free software license published by the free software foundation fsf.
Software licensed with any gnu license can be used and even modified everywhere, including in a corporate environment, without any restrictions. Why should i use the gnu gpl rather than other free software licenses. The gnu general public license, version 2 is the license created by the free software foundation and the gnu project in order to be used for software documentation a work licensed in this way grants all the four freedoms listed in the definition of free cultural works. Although there are different rules for free software licenses four freedoms and open source licenses open source definition, what is not apparent from those two sets of rules is. Software licensed with any gnu license can be used and even modified. The library refers to a covered work governed by this license, other than an application or a combined work as defined below. Software under the gpl may be run for all purposes, including commercial. Copies published by the free software foundation raise funds for gnu development.
It can be used with readilyavailable lowcost external rf hardware to create software defined radios, or without hardware in a simulationlike environment. Busybox is licensed under the gnu general public license, version 2. In this course, youll build flexible sdr applications using gnu radio through exercises that will help you learn the fundamentals of digital signal processing dsp needed to. Image transfer and software defined radio using usrp and gnu. Usrp software licensing ettus research, a national. Usrp software licensing the leader in software defined. Whether it is a copyleft license whether it is compatible with the gnu gpl. Gnu library general public license v2 or later software. The gnu gpl allows users to change and share all versions of a program. We use only licenses that are compatible with the gnu gpl for gnu software. Software under the gpl may be run for all purposes, including. It is similar to the gnu general public license, giving readers the rights to copy, redistribute, and modify except for invariant sections a work and requires all copies and derivatives to be available under the same. Jun 29, 2007 by contrast, the gnu general public license is intended to guarantee your freedom to share and change all versions of a programto make sure it remains free software for all its users.
Users or companies who distribute gpllicensed works e. Gnu radio is a free software development toolkit that provides signal processing blocks to implement software defined radios and signalprocessing systems. You have freedom to copy and modify this gnu manual, like gnu software. A copy of the license is included in the section entitled gnu free documentation license. These licenses are so simple that no dedicated text is needed to expose the terms of the license. This page is maintained by the free software foundations licensing and compliance lab. It was initially created for use with software documentation, but can be applied to other types of works as well, such as wikipedia. Gnu is composed wholly of free software, most of which is licensed under the gnu projects own general public license. Frequently asked questions about the gnu licenses gnu. The combined operating systemmost commonly called linuxwas released under the gnu general public license gpl, a licensing model that was created by richard stallman of the gnu project. Software licensing describes the legal rights pertaining to the authorized use of digital material. It was made up by the free software foundation fsf for the gnu project. From complete operating systems like gnu, to over 5,000 individual programs and tools listed in the fsfunesco free software directory. Can gpl licenced software be used in corporate environments.
It complements the gnu general public license, which is a copyleft license designed for free software. In other words, without acceptance of the license, the enduser may not use the software at all. Nov 16, 2019 short for gnu general public license, the gpl is a general license published by gnu project. This may mean multiple different software licenses or sets of licenses. However be aware that if you or the company ever make changes to the software and want to distribute it, it must be distributed with full source code, on the same license terms as the original software. Download software defined radio transceiver for free. It is appropriate to use for libraries and projects that want to allow linking from nongpl and nonopensource software. Image transfer and software defined radio using usrp and gnu radio overview.
Gnu free documentation license simple english wikipedia. By contrast, the gnu general public license is intended to guarantee your freedom to share and change all versions of a programto make sure it remains free software for all its users. Sep 26, 20 10 things you can do with software defined radio a look at just a small selection of the things that can be done using software defined radio. Permission is granted to copy, distribute andor modify this document under the terms of the gnu free documentation license, version 1. The licenses were originally written by richard stallman, former head of the free software foundation fsf, for the gnu project, and grant the recipients of a. What is free software and why is it so important for. Can i use gpl software in a commercial application software. Since its introduction in 1997, gnupg is free software meaning that it respects your freedom. Open source software defined radio using gnu radio and usrp sunita barve, aditya akotkar, amit chavan, awadhesh kumar, manoj dhaigude. Monitoring the internal status of the software receiver 9 minute read this tutorial describes how to monitor the internal status of gnsssdr. Various licenses and comments about them gnu project. Difference between various opensource software licenses.
It can be freely used, modified and distributed under the terms of the gnu general public license. In parallel with the set of gnu licenses including the gnu gpl, the free software world evolved a number of very simple permissive copyfree licenses. The purpose is to implement code that comes as close to the antenna as possible. The gnu free documentation license gnu fdl or simply gfdl is a copyleft license for open content such as software.
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