diff --git a/app/helpers/context_helper.rb b/app/helpers/context_helper.rb
index 03ca88670f..077c5272a5 100644
--- a/app/helpers/context_helper.rb
+++ b/app/helpers/context_helper.rb
@@ -34,6 +34,7 @@ module ContextHelper
     license: { 'schema' => 'http://schema.org#', 'license' => 'schema:license' },
     suspended: { 'toot' => 'http://joinmastodon.org/ns#', 'suspended' => 'toot:suspended' },
     attribution_domains: { 'toot' => 'http://joinmastodon.org/ns#', 'attributionDomains' => { '@id' => 'toot:attributionDomains', '@type' => '@id' } },
+    misskey_license: { 'misskey' => 'https://misskey-hub.net/ns#', '_misskey_license' => 'misskey:_misskey_license' },
   }.freeze
 
   def full_context
diff --git a/app/lib/activitypub/case_transform.rb b/app/lib/activitypub/case_transform.rb
index 5f2430600e..33e3ef6fac 100644
--- a/app/lib/activitypub/case_transform.rb
+++ b/app/lib/activitypub/case_transform.rb
@@ -4,6 +4,7 @@ module ActivityPub::CaseTransform
   class << self
     NO_CONVERT_VALUES = %w(
       _misskey_content
+      _misskey_license
       _misskey_quote
     ).freeze
 
diff --git a/app/lib/activitypub/parser/custom_emoji_parser.rb b/app/lib/activitypub/parser/custom_emoji_parser.rb
index 0c38f55168..fcd36b0395 100644
--- a/app/lib/activitypub/parser/custom_emoji_parser.rb
+++ b/app/lib/activitypub/parser/custom_emoji_parser.rb
@@ -34,6 +34,6 @@ class ActivityPub::Parser::CustomEmojiParser
   end
 
   def license
-    @json['license'] || @json['licence']
+    @json.dig('_misskey_license', 'freeText') || @json['license'] || @json['licence']
   end
 end
diff --git a/app/presenters/activitypub/misskey_emoji_license_presenter.rb b/app/presenters/activitypub/misskey_emoji_license_presenter.rb
new file mode 100644
index 0000000000..db8de36171
--- /dev/null
+++ b/app/presenters/activitypub/misskey_emoji_license_presenter.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class ActivityPub::MisskeyEmojiLicensePresenter < ActiveModelSerializers::Model
+  attributes :free_text
+end
diff --git a/app/serializers/activitypub/emoji_serializer.rb b/app/serializers/activitypub/emoji_serializer.rb
index 24c21c3ccf..443edd7e53 100644
--- a/app/serializers/activitypub/emoji_serializer.rb
+++ b/app/serializers/activitypub/emoji_serializer.rb
@@ -3,11 +3,12 @@
 class ActivityPub::EmojiSerializer < ActivityPub::Serializer
   include RoutingHelper
 
-  context_extensions :emoji, :license, :keywords
+  context_extensions :emoji, :license, :keywords, :misskey_license
 
   attributes :id, :type, :name, :keywords, :is_sensitive, :updated
 
-  attribute :license, if: -> { object.license.present? }
+  attribute :license, if: :license?
+  has_one :misskey_license, key: :_misskey_license, if: :license?, serializer: ActivityPub::MisskeyEmojiLicenseSerializer
 
   has_one :icon, serializer: ActivityPub::ImageSerializer
 
@@ -34,4 +35,12 @@ class ActivityPub::EmojiSerializer < ActivityPub::Serializer
   def name
     ":#{object.shortcode}:"
   end
+
+  def misskey_license
+    ActivityPub::MisskeyEmojiLicensePresenter.new(free_text: object.license)
+  end
+
+  def license?
+    object.license.present?
+  end
 end
diff --git a/app/serializers/activitypub/misskey_emoji_license_serializer.rb b/app/serializers/activitypub/misskey_emoji_license_serializer.rb
new file mode 100644
index 0000000000..fcaf37aff4
--- /dev/null
+++ b/app/serializers/activitypub/misskey_emoji_license_serializer.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class ActivityPub::MisskeyEmojiLicenseSerializer < ActivityPub::Serializer
+  attribute :free_text, key: :freeText
+end
diff --git a/spec/lib/activitypub/parser/custom_emoji_parser_spec.rb b/spec/lib/activitypub/parser/custom_emoji_parser_spec.rb
new file mode 100644
index 0000000000..89421b6d6d
--- /dev/null
+++ b/spec/lib/activitypub/parser/custom_emoji_parser_spec.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ActivityPub::Parser::CustomEmojiParser do
+  subject { described_class.new(json) }
+
+  context 'with fedibird license' do
+    let(:json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: ['https://example.com/#foo'].join,
+        name: 'ohagi',
+        license: 'Ohagi is ohagi',
+      }.with_indifferent_access
+    end
+
+    it 'load license' do
+      expect(subject.license).to eq 'Ohagi is ohagi'
+    end
+  end
+
+  context 'with misskey license' do
+    let(:json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: ['https://example.com/#foo'].join,
+        name: 'ohagi',
+        _misskey_license: {
+          freeText: 'Ohagi is ohagi',
+        },
+      }.with_indifferent_access
+    end
+
+    it 'load license' do
+      expect(subject.license).to eq 'Ohagi is ohagi'
+    end
+  end
+
+  context 'without license' do
+    let(:json) do
+      {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        id: ['https://example.com/#foo'].join,
+        name: 'ohagi',
+      }.with_indifferent_access
+    end
+
+    it 'do not load license' do
+      expect(subject.license).to be_nil
+    end
+  end
+end
diff --git a/spec/serializers/activitypub/emoji_serializer_spec.rb b/spec/serializers/activitypub/emoji_serializer_spec.rb
new file mode 100644
index 0000000000..4384ae4b13
--- /dev/null
+++ b/spec/serializers/activitypub/emoji_serializer_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ActivityPub::EmojiSerializer do
+  describe '.serializer_for' do
+    subject { serialized_record_json(model, described_class, adapter: ActivityPub::Adapter) }
+
+    let(:model) { Fabricate(:custom_emoji) }
+
+    context 'without license' do
+      it 'does not have information' do
+        expect(subject).to_not include({
+          '_misskey_license' => { 'freeText' => 'Ohagi' },
+        })
+        expect(subject).to_not include({
+          'license' => 'Ohagi',
+        })
+      end
+    end
+
+    context 'with license' do
+      let(:model) { Fabricate(:custom_emoji, license: 'Ohagi') }
+
+      it 'has information' do
+        expect(subject).to include({
+          'license' => 'Ohagi',
+          '_misskey_license' => { 'freeText' => 'Ohagi' },
+        })
+      end
+    end
+  end
+end