diff --git a/packages/contracts/src/support/concerns/index.ts b/packages/contracts/src/support/concerns/index.ts
index 0db5cd7d..d0919204 100644
--- a/packages/contracts/src/support/concerns/index.ts
+++ b/packages/contracts/src/support/concerns/index.ts
@@ -1,5 +1,3 @@
-import { DANGEROUS_PROPERTIES } from "@aedart/contracts/support/objects";
-
 /**
  * Support Concerns identifier
  *
@@ -7,31 +5,6 @@ import { DANGEROUS_PROPERTIES } from "@aedart/contracts/support/objects";
  */
 export const SUPPORT_CONCERNS: unique symbol = Symbol('@aedart/contracts/support/concerns');
 
-/**
- * @deprecated TODO: This MUST be redesigned, such that each Concern class can provide a list of what to expose
- * 
- * Symbol used by a {@link Concern} to define properties or methods that must be
- * "hidden" and not allowed to be aliased into a target class.
- * 
- * **Note**: _Symbol MUST be used to as name for a "static" method in the desired Concern class._
- * 
- * **Example**:
- * ```ts
- * class MyConcern implements Concern
- * {
- *      static [HIDDEN](): PropertyKey[]
- *      {
- *          // ...not shown...
- *      }
- *      
- *      // ...remaining not shown...
- * }
- * ```
- * 
- * @type {symbol}
- */
-export const HIDDEN: unique symbol = Symbol('hidden');
-
 /**
  * Symbol used by a [concern class]{@link ConcernConstructor} to indicate what properties
  * and methods can be aliased into a target class.
@@ -74,48 +47,6 @@ export const CONCERN_CLASSES: unique symbol = Symbol('concern_classes');
  */
 export const CONCERNS: unique symbol = Symbol('concerns');
 
-/**
- * @deprecated TODO: Move this into support/concerns. It is way too implementation specific to belong here.
- * 
- * List of properties and methods that must always remain "hidden" and
- * **NEVER** be aliased into a target class' prototype.
- * 
- * @type {ReadonlyArray<PropertyKey>}
- */
-export const ALWAYS_HIDDEN: ReadonlyArray<PropertyKey> = [
-    
-    ...DANGEROUS_PROPERTIES,
-    
-    // ----------------------------------------------------------------- //
-    // Defined by Concern interface / Abstract Concern:
-    // ----------------------------------------------------------------- //
-    
-    // It is NOT possible, nor advised to attempt to alias a Concern's
-    // constructor into a target class.
-    'constructor',
-    
-    // The concernOwner property (getter) shouldn't be aliased either
-    'concernOwner',
-    
-    // If the Concern defines any hidden properties or methods,
-    // then such a method will not do any good in a target class.
-    HIDDEN,
-    
-    // The static properties and methods (just in case...)
-    PROVIDES,
-    'resolvedConcernKeys',
-    'removeAlwaysHiddenKeys',
-    'rememberConcernKeys',
-
-    // ----------------------------------------------------------------- //
-    // Other properties and methods:
-    // ----------------------------------------------------------------- //
-    
-    // In case that a concern class uses other concerns, prevent them
-    // from being aliased.
-    CONCERNS,
-];
-
 import Concern from "./Concern";
 import ConcernConstructor from "./ConcernConstructor";
 import Configuration from "./Configuration";
@@ -136,5 +67,4 @@ export {
 }
 
 export * from './exceptions/index';
-
 export * from './types';
\ No newline at end of file