Use CC0 license.

Author: gkellogg

etc/doap.jsonld

@@ -26,7 +26,7 @@
     "@type":              "doap:Project",
     "doap:name":          "JSON::LD",
     "doap:homepage":      "https://github.com/ruby-rdf/json-ld/",
-    "doap:license":       "http://creativecommons.org/licenses/publicdomain/",
+    "doap:license":       "http://creativecommons.org/publicdomain/zero/1.0/",
     "doap:shortdesc":     "JSON-LD support for RDF.rb.",
     "doap:description":   "RDF.rb extension for parsing/serializing JSON-LD data.",
     "doap:created":       "2011-05-07",

etc/doap.nt

@@ -14,7 +14,7 @@
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#implements> <https://www.w3.org/TR/json-ld11-api/> .
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#implements> <https://www.w3.org/TR/json-ld11-framing/> .
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#implements> <https://www.w3.org/TR/json-ld11/> .
-<https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#license> <http://creativecommons.org/licenses/publicdomain/> .
+<https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#license> <http://creativecommons.org/publicdomain/zero/1.0/> .
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#maintainer> <https://greggkellogg.net/foaf#me> .
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#name> "JSON::LD" .
 <https://rubygems.org/gems/json-ld> <http://usefulinc.com/ns/doap#programming-language> "Ruby" .

etc/doap.ttl

@@ -19,7 +19,7 @@
    doap:implements <https://www.w3.org/TR/json-ld11/>,
      <https://www.w3.org/TR/json-ld11-api/>,
      <https://www.w3.org/TR/json-ld11-framing/>;
-   doap:license <http://creativecommons.org/licenses/publicdomain/>;
+   doap:license <http://creativecommons.org/publicdomain/zero/1.0/>;
    doap:maintainer <https://greggkellogg.net/foaf#me>;
    doap:name "JSON::LD"^^xsd:string;
    doap:programming-language "Ruby";

etc/earl-stream.ttl

@@ -18,7 +18,7 @@
    doap:implements <https://www.w3.org/TR/json-ld11/>,
      <https://www.w3.org/TR/json-ld11-api/>,
      <https://www.w3.org/TR/json-ld11-framing/>;
-   doap:license <http://creativecommons.org/licenses/publicdomain/>;
+   doap:license <http://creativecommons.org/publicdomain/zero/1.0/>;
    doap:maintainer <https://greggkellogg.net/foaf#me>;
    doap:name "JSON::LD"^^xsd:string;
    doap:programming-language "Ruby"^^xsd:string;

etc/earl.ttl

@@ -18,7 +18,7 @@
    doap:implements <https://www.w3.org/TR/json-ld11/>,
      <https://www.w3.org/TR/json-ld11-api/>,
      <https://www.w3.org/TR/json-ld11-framing/>;
-   doap:license <http://creativecommons.org/licenses/publicdomain/>;
+   doap:license <http://creativecommons.org/publicdomain/zero/1.0/>;
    doap:maintainer <https://greggkellogg.net/foaf#me>;
    doap:name "JSON::LD"^^xsd:string;
    doap:programming-language "Ruby"^^xsd:string;