GPL compatibility License compatibility

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1 gpl compatibility

1.1 copyleft licenses , gpl
1.2 gfdl , gpl
1.3 cddl , gpl
1.4 cc by-sa , gplv3





gpl compatibility

to minimize license proliferation , license incompatibilities in foss ecosystem, organizations (the free software foundation, instance) , individuals (david a. wheeler), argue compatibility used gpl important feature of software licenses. many of common free-software licenses, permissive licenses, such original mit/x license, bsd licenses (in three-clause , two-clause forms, though not original four-clause form), mpl 2.0, , lgpl, gpl-compatible. is, code can combined program under gpl without conflict, , new combination have gpl applied whole (but other license not apply).


copyleft licenses , gpl

copyleft software licenses not inherently gpl-compatible; gplv2 license not compatible gplv3 or lgplv3. if tried combine code released under either of later gpl licenses gplv2 code, violate section 6 of gplv2, source of incompatibility. however, code under later licenses can combined code licensed under gpl version 2 or later. software released under gplv2 allow use terms of later versions of gpl well, , have exception clauses allow combining them software under different licenses or license versions.


gfdl , gpl

the free software foundation-recommended gnu free documentation license incompatible gpl license, , text licensed under gfdl cannot incorporated gpl software. therefore, debian project decided, in 2006 resolution, license documentation under gpl. floss manuals foundation followed debian in 2007. in 2009, wikimedia foundation switched gfdl creative commons cc-by-sa license main license projects.


cddl , gpl

another case gpl compatibility problematic cddl licensed zfs file system gplv2 licensed linux kernel. despite both free software under copyleft license, zfs not distributed linux distros debian (but distributed freebsd , mac os) cddl considered incompatible gpl ed linux kernel, free software foundation , parties relations fsf. legal interpretation—of if , when combination constitutes combined work or derivative work of gpled kernel—is ambiguous , controversial. in 2015, cddl gpl compatibility question reemerged when linux distribution ubuntu announced include openzfs default. in 2016, ubuntu announced legal review resulted in conclusion legally safe use zfs binary kernel module in linux. others accepted ubuntu s conclusion; instance lawyer james e.j. bottomley argued convincing theory of harm cannot developed, making impossible bring case court. eben moglen, co-author of gplv3 , founder of sflc, argued while letters of gpl might violated spirit of both licenses adhered to, relevant issue in court. on other hand, bradley m. kuhn , karen m. sandler, software freedom conservancy, argued ubuntu violate both licenses, binary zfs module derivative work of linux kernel, , announced intent achieve clarity in question, going court.


cc by-sa , gplv3

on october 8, 2015, creative commons concluded cc by-sa 4.0 one-way compatible gplv3.








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