Changes between Version 43 and Version 44 of FAQ


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Timestamp:
May 20, 2008 2:33:50 PM (11 years ago)
Author:
bennylp
Comment:

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  • FAQ

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    64 === What about the "viral" nature of the GPL? === #gpl-viral 
    65  
    66 People often think that using GPL-ed software means that other software linked with the GPL software have to be GPL too, hence GPL is considered as viral. '''That is not exactly true''', especially with PJSIP. When linking with PJSIP, only the application (that is based on PJSIP) has to be GPL-ed, since it is considered as derived work. Other libraries linked with PJSIP don't have to be GPL, because we specifically allow linking PJSIP with third party libraries, as long as they are listed in [http://www.pjsip.org/licensing.htm Third Party Software] that are allowed to be linked with PJSIP. 
     64=== What about the "viral" nature of the GPL? === #gpl 
     65 
     66People often think that using GPL-ed software means that other software linked with the GPL software have to be GPL too, hence GPL is considered as viral. '''That is not exactly true'''. Don't forget that GPL '''is compatible''' with many other free software licenses, including: 
     67 - [http://www.gnu.org/licenses/info/Sleepycat.html Berkeley Database License],  
     68 - [http://www.gnu.org/licenses/ecos-license.html eCos license version 2.0],  
     69 - [http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5 Modified BSD license] (the original BSD license modified by removal of the advertising clause, sometimes is referred to as the 3-clause BSD license),  
     70 - [http://www.jclark.com/xml/copying.txt Expat License],  
     71 - [http://www.freebsd.org/copyright/freebsd-license.html FreeBSD license],  
     72 - [http://www.xfree86.org/3.3.6/COPYRIGHT2.html#3, and of course,  
     73 - [http://www.gnu.org/licenses/lgpl.html GNU LGPL]. 
     74 
     75And don't forget that the PJSIP license is GPLv2 '''or later''', which means one can use PJSIP under GPLv3, which is compatible with even more licenses such as: 
     76 - [http://www.apache.org/licenses/LICENSE-2.0 Apache License Version 2.0] and  
     77 - [http://www.microsoft.com/resources/sharedsource/licensingbasics/publiclicense.mspx Microsoft Public License (Ms-PL)]. 
     78 
     79For more complete list of licenses that are compatible with GPL, please see http://www.gnu.org/licenses/license-list.html. 
     80 
     81In addition, we specifically allow linking PJSIP with some open source third party libraries, as they are listed in [http://www.pjsip.org/licensing.htm Third Party Software] page. 
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