diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 73f6b4d4ba..fe1f32992a 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -188,6 +188,9 @@ export class ApRendererService {
 				// || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
 				url: emoji.publicUrl || emoji.originalUrl,
 			},
+			_misskey_license: {
+				freeText: emoji.license
+			},
 		};
 	}
 
diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index f190a5bdca..5293ca96ff 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -536,6 +536,8 @@ export class ApNoteService {
 						originalUrl: tag.icon.url,
 						publicUrl: tag.icon.url,
 						updatedAt: new Date(),
+						// _misskey_license が存在しなければ `null`
+						license: (tag._misskey_license?.freeText ?? null)
 					});
 
 					const emoji = await this.emojisRepository.findOneBy({ host, name });
@@ -557,6 +559,8 @@ export class ApNoteService {
 				publicUrl: tag.icon.url,
 				updatedAt: new Date(),
 				aliases: [],
+				// _misskey_license が存在しなければ `null`
+				license: (tag._misskey_license?.freeText ?? null)
 			});
 		}));
 	}
diff --git a/packages/backend/src/core/activitypub/type.ts b/packages/backend/src/core/activitypub/type.ts
index 7282bfd546..e4930dd9d8 100644
--- a/packages/backend/src/core/activitypub/type.ts
+++ b/packages/backend/src/core/activitypub/type.ts
@@ -249,6 +249,11 @@ export interface IApEmoji extends IObject {
 	type: 'Emoji';
 	name: string;
 	updated: string;
+	// Misskey拡張。後方互換性のためにoptional。
+	// 将来の拡張性を考慮してobjectにしている
+	_misskey_license?: {
+		freeText: string | null;
+	};
 }
 
 export const isEmoji = (object: IObject): object is IApEmoji =>