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However, GPLv3 software could only be combined and share code with GPLv2 software if the GPLv2 license used had the optional "or later" clause and the software was upgraded to GPLv3. While the "GPLv2 or any later version" clause is considered by FSF as the most common form of licensing GPLv2 software, [43] Toybox developer Rob Landley described ...
"Free Software Foundation Releases GNU Affero General Public License Version 3" (Press release). Smith, Brett (March 29, 2007), GPLv3 and Software as a Service – also includes info on version 2 of the Affero GPL. Kuhn, Bradley M. (March 19, 2002).
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
License compatibility is a legal framework that allows for pieces of software with different software licenses to be distributed together. The need for such a framework arises because the different licenses can contain contradictory requirements, rendering it impossible to legally combine source code from separately-licensed software in order to create and publish a new program.
License proliferation is especially a problem when licenses have only limited or complicated license compatibility relationships with other licenses. Therefore, some consider compatibility with the widely used GNU General Public License (GPL) an important characteristic, for instance David A. Wheeler [2] [3] as also the Free Software Foundation (FSF), who maintains a list of the licenses that ...
[3] [4] The OSI does not endorse FSF license analysis (interpretation) as per their disclaimer. [ 5 ] The FSF's Free Software Definition focuses on the user's unrestricted rights to use a program, to study and modify it, to copy it, and to redistribute it for any purpose, which are considered by the FSF the four essential freedoms .
This new threat was one of the reasons for writing version 3 of the GNU GPL in 2006. [43] In recent years, a term coined tivoization describes a process where hardware restrictions are used to prevent users from running modified versions of the software on that hardware, in which the TiVo device is an example.
Tivoization (/ ˌ t iː v oʊ ɪ ˈ z eɪ ʃ ən,-aɪ-/) is the practice of designing hardware that incorporates software under the terms of a copyleft software license like the GNU General Public License (GNU GPL), but uses hardware restrictions or digital rights management (DRM) to prevent users from running modified versions of the software on that hardware.