use a dual license of public domain or CC0-1.0-Universal

Closes python#123

pep-0001.txt

@@ -486,9 +486,8 @@ Each PEP should have the following parts/sections:
 
 12. References -- A collection of URLs used as references through the PEP.
 
-13. Copyright/public domain -- Each PEP must either be explicitly
-    labeled as placed in the public domain (see this PEP as an
-    example) or licensed under the `Open Publication License`_.
+13. Copyright/license -- Each PEP must be placed under a dual license of
+    public domain and CC0-1.0-Universal_ (see this PEP for an example).
 
 
 PEP Formats and Templates
@@ -772,7 +771,7 @@ References and Footnotes
 .. _issue tracker:
    http://bugs.python.org/
 
-.. _Open Publication License: http://www.opencontent.org/openpub/
+.. _CC0-1.0-Universal: https://choosealicense.com/licenses/cc0-1.0/
 
 .. _reStructuredText: http://docutils.sourceforge.net/rst.html
 
@@ -788,7 +787,8 @@ References and Footnotes
 Copyright
 =========
 
-This document has been placed in the public domain.
+This document is placed in the public domain or under the
+CC0-1.0-Universal license, whichever is more permissive.
 
 
 ..

pep-0012.rst

@@ -1,14 +1,18 @@
 PEP: 12
 Title: Sample reStructuredText PEP Template
 Author: David Goodger <[email protected]>,
-        Barry Warsaw <[email protected]>
+        Barry Warsaw <[email protected]>,
+        Brett Cannon <[email protected]>
 Status: Active
 Type: Process
 Content-Type: text/x-rst
 Created: 05-Aug-2002
 Post-History: 30-Aug-2002
 
 
+.. note::
+    For those who have written a PEP before, there is a template_.
+
 Abstract
 ========
 
@@ -607,8 +611,12 @@ above), use double-backquotes::
 
 Suggested Sections
 ==================
+
 Various sections are found to be common across PEPs and are outlined in
 PEP 1 [1]_. Those sections are provided here for convenience.
+
+.. _template:
+
 ::
 
   Abstract
@@ -680,7 +688,8 @@ PEP 1 [1]_. Those sections are provided here for convenience.
   Copyright
   =========
 
-  This document has been placed in the public domain.
+  This document is placed in the public domain or under the
+  CC0-1.0-Universal license, whichever is more permissive.
 
 
   
@@ -736,7 +745,8 @@ References
 Copyright
 =========
 
-This document has been placed in the public domain.
+This document is placed in the public domain or under the
+CC0-1.0-Universal license, whichever is more permissive.