make same-license requirement, add to all copyleft licenses

README.md

@@ -84,6 +84,7 @@ The license properties (rules) are stored as a bulleted list within the licenses
 * `disclose-source` - Source code must be made available when distributing the software.
 * `network-use-disclose` - Users who interact with the software via network are given the right to receive a copy of the corresponding source code.
 * `rename` - You must change the name of the software if you modify it.
+* `same-license` - Modifications must be released under the same license when distributing the software. In some cases a similar or related license may be used.
 
 #### Permitted
 

_data/rules.yml

@@ -14,6 +14,9 @@ required:
 - description: You must change the name of the software if you modify it.
   label: Rename
   tag: rename
+- description: Modifications must be released under the same license when distributing the software. In some cases a similar or related license may be used.
+  label: Same License
+  tag: same-license
 
 permitted:
 - description: This software and derivatives may be used for commercial purposes.

_licenses/agpl-3.0.html

@@ -18,6 +18,7 @@ required:
   - document-changes
   - disclose-source
   - network-use-disclose
+  - same-license
 
 permitted:
   - commercial-use

_licenses/epl-1.0.html

@@ -18,6 +18,7 @@ using:
 required:
   - disclose-source
   - include-copyright
+  - same-license
 
 permitted:
   - commercial-use

_licenses/eupl-1.1.html

@@ -18,6 +18,7 @@ required:
   - disclose-source
   - document-changes
   - network-use-disclose
+  - same-license
 
 permitted:
   - commercial-use

_licenses/gpl-2.0.html

@@ -17,6 +17,7 @@ required:
   - include-copyright
   - document-changes
   - disclose-source
+  - same-license
 
 permitted:
   - commercial-use

_licenses/gpl-3.0.html

@@ -17,6 +17,7 @@ required:
   - include-copyright
   - document-changes
   - disclose-source
+  - same-license
 
 permitted:
   - commercial-use

_licenses/lgpl-2.1.html

@@ -16,6 +16,7 @@ note: The Free Software Foundation recommends taking the additional step of addi
 required:
   - include-copyright
   - disclose-source
+  - same-license
 
 permitted:
   - commercial-use

_licenses/lgpl-3.0.html

@@ -15,6 +15,8 @@ note: The Free Software Foundation recommends taking the additional step of addi
 required:
   - include-copyright
   - disclose-source
+  - same-license
+
 
 permitted:
   - commercial-use

_licenses/mpl-2.0.html

@@ -10,6 +10,7 @@ how: Create a text file (typically named LICENSE or LICENSE.txt) in the root of
 required:
   - disclose-source
   - include-copyright
+  - same-license
 
 permitted:
   - commercial-use

_licenses/ms-rl.html

@@ -9,6 +9,7 @@ how: Create a text file (typically named LICENSE or LICENSE.txt) in the root of
 
 required:
   - include-copyright
+  - same-license
 
 permitted:
   - commercial-use

_licenses/ofl-1.1.html

@@ -11,6 +11,7 @@ note: This license doesn't require source provision, but recommends it. All file
 
 required:
   - include-copyright
+  - same-license
 
 permitted:
   - private-use

_licenses/osl-3.0.html

@@ -18,6 +18,7 @@ using:
 required:
   - include-copyright
   - disclose-source
+  - same-license
 
 permitted:
   - commercial-use