MBS-12977: Correctly specify the licenses of the JSON dumps

We were claiming this is all CC0, but that is not correct.
The JSON dumps contain annotation, rating and tag data,
all of which is supplementary / CC-BY-NC-SA data.

Talked with mayhem and mwiencek about this, we agreed
that the right thing to do is to update the dump docs to specify
the right licenses rather than dropping the supplementary data,
since it can be useful and there's no great way to provide it separately
like on the MB dumps.

lib/MusicBrainz/Script/JSONDump.pm

@@ -91,6 +91,13 @@ sub create_json_dump {
     local $MusicBrainz::Script::MBDump::readme_text = <<'EOF';
 The file under mbdump/ contains one document (entity) per line, in JSON
 format, and is named according to the type of entity in the dump.
+EOF
+
+    my $copying_text = <<'EOF';
+The content of this dump is licensed under the CC0 license
+(see COPYING-PublicDomain), except for any data under keys "annotation",
+"genres", "ratings" and "tags", which is licensed under a Creative Commons
+Attribution-NonCommercial-ShareAlike 3.0 license (see COPYING-CCShareAlike).
 EOF
 
     my $mbdump = MusicBrainz::Script::MBDump->new(
@@ -100,9 +107,16 @@ EOF
         %mbdump_options,
     );
 
+    $mbdump->write_file('COPYING', $copying_text);
+
     $mbdump->copy_file(
         catfile(DBDefs->MB_SERVER_ROOT, 'admin', 'COPYING-PublicDomain'),
-        'COPYING'
+        'COPYING-PublicDomain'
+    ) or die $OS_ERROR;
+
+    $mbdump->copy_file(
+        catfile(DBDefs->MB_SERVER_ROOT, 'admin', 'COPYING-CCShareAlike'),
+        'COPYING-CCShareAlike'
     ) or die $OS_ERROR;
 
     $mbdump->write_file('JSON_DUMPS_SCHEMA_NUMBER', "1\n");
@@ -114,7 +128,11 @@ EOF
     if ($self->compression_enabled) {
         $mbdump->make_tar(
             "$dump_fname.tar.xz",
-            "mbdump/$dump_fname",
+            (
+                "mbdump/$dump_fname",
+                'COPYING-PublicDomain',
+                'COPYING-CCShareAlike',
+            ),
             'JSON_DUMPS_SCHEMA_NUMBER',
         );
     } else {

t/script/DumpJSON.t

@@ -127,6 +127,24 @@ test all => sub {
             File::Spec->catfile($dir, $entity, 'JSON_DUMPS_SCHEMA_NUMBER'));
         chomp $got;
         is($got, '1');
+
+        $got = read_file(
+            File::Spec->catfile($dir, $entity, 'COPYING'));
+        chomp $got;
+        ok(
+            $got =~ 'see COPYING-CCShareAlike',
+            'The COPYING file refers users to the per-license COPYING files',
+        );
+
+        ok(
+            -f File::Spec->catfile($dir, $entity, 'COPYING-PublicDomain'),
+            'The COPYING-PublicDomain file is included in the bundle',
+        );
+
+        ok(
+            -f File::Spec->catfile($dir, $entity, 'COPYING-CCShareAlike'),
+            'The COPYING-CCShareAlike file is included in the bundle',
+        );
     };
 
     my $test_dumps_empty_except = sub {