Reciprocal Licenses

GPL v2	GPL is the most widely used free software license and is fully reciprocal. Derived works must be distributed under the same license. View full license »
Required	Copyright inclusion State changes Disclose Source
Permitted	Commercial use Modification Distribution Warranty
Forbidden	Liability Sublicensing

GPL v3	Version 3 of the GPL adds a clause that requires source code when distributed on hardware devices. View full license »
Required	Copyright inclusion State changes Disclose Source
Permitted	Commercial use Modification Distribution Warranty
Forbidden	Liability Sublicensing

LGPL v2.1	Primarily used for software libraries, LGPL requires that derived works be licensed under the same license, but works that only link to it do not fall under this restriction. View full license »
Required	Copyright inclusion Nonstatic linkage
Permitted	Commercial use Modification Distribution Sublicensing
Forbidden	Liability

LGPL v3	Version 3 of the LGPL is an additional set of permissions to the GPL v3 license that requires that derived works be licensed under the same license, but works that only link to it do not fall under this restriction. View full license »
Required	Copyright inclusion Nonstatic linkage
Permitted	Commercial use Modification Distribution Sublicensing
Forbidden	Liability