diff --git a/package-lock.json b/package-lock.json
index d6f1a578cad4cae9ae63b44019aa23432c207f74..fe299f152d37be38e2bac5f1f44c53315c777b38 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
         "@stomp/ng2-stompjs": "^7.2.0",
         "angular-tag-cloud-module": "^5.3.0",
         "angularx-qrcode": "^11.0.0",
+        "badwords-list": "^1.0.0",
         "chart.js": "^2.9.4",
         "core-js": "^2.5.7",
         "get-stream": "^6.0.1",
@@ -34,8 +35,9 @@
         "is-promise": "^4.0.0",
         "mat-color-picker": "^1.4.3",
         "material-design-icons": "^3.0.1",
+        "naughty-words": "^1.2.0",
         "ngx-color-picker": "^11.0.0",
-        "ngx-markdown": "^9.0.0",
+        "ngx-markdown": "^11.1.3",
         "ngx-matomo": "^0.1.4",
         "ngx-matomo-v9": "^0.3.0",
         "rxjs": "^6.5.4",
@@ -2584,9 +2586,9 @@
       "dev": true
     },
     "node_modules/@types/marked": {
-      "version": "0.7.2",
-      "resolved": "https://registry.npmjs.org/@types/marked/-/marked-0.7.2.tgz",
-      "integrity": "sha512-A3EDyNaq6OCcpaOia2HQ/tu2QYt8DKuj4ExP21VU3cU3HTo2FLslvbqa2T1vux910RHvuSVqpwKnnykSFcRWOA=="
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@types/marked/-/marked-2.0.2.tgz",
+      "integrity": "sha512-P4zanhCQKs4tiWPPBGpB7lHflgFCP9DFGNI5YtpW9MALKoy2qs9rHNWJ+z55cegD9uCfnmsKuaosq9FNvbxrOw=="
     },
     "node_modules/@types/minimatch": {
       "version": "3.0.4",
@@ -3800,6 +3802,11 @@
         "object.assign": "^4.1.0"
       }
     },
+    "node_modules/badwords-list": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/badwords-list/-/badwords-list-1.0.0.tgz",
+      "integrity": "sha1-XphW2/E0gqKVw7CzBK+51M/FxXk="
+    },
     "node_modules/balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -4862,7 +4869,8 @@
     "node_modules/commander": {
       "version": "2.20.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ=="
+      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+      "dev": true
     },
     "node_modules/comment-parser": {
       "version": "1.1.5",
@@ -6171,6 +6179,11 @@
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="
     },
+    "node_modules/emoji-toolkit": {
+      "version": "6.5.1",
+      "resolved": "https://registry.npmjs.org/emoji-toolkit/-/emoji-toolkit-6.5.1.tgz",
+      "integrity": "sha512-oY5E81cXvRUxXkbVgOI8NxYHKF5FeWfJhFCIYUKhbVfSmdCH8+bmJzgDdhufExa7t1+WEzpUFdHwYxJTXS90vQ=="
+    },
     "node_modules/emojis-list": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-3.0.0.tgz",
@@ -10018,16 +10031,24 @@
       }
     },
     "node_modules/katex": {
-      "version": "0.11.1",
-      "resolved": "https://registry.npmjs.org/katex/-/katex-0.11.1.tgz",
-      "integrity": "sha512-5oANDICCTX0NqYIyAiFCCwjQ7ERu3DQG2JFHLbYOf+fXaMoH8eg/zOq5WSYJsKMi/QebW+Eh3gSM+oss1H/bww==",
+      "version": "0.13.11",
+      "resolved": "https://registry.npmjs.org/katex/-/katex-0.13.11.tgz",
+      "integrity": "sha512-yJBHVIgwlAaapzlbvTpVF/ZOs8UkTj/sd46Fl8+qAf2/UiituPYVeapVD8ADZtqyRg/qNWUKt7gJoyYVWLrcXw==",
       "dependencies": {
-        "commander": "^2.19.0"
+        "commander": "^6.0.0"
       },
       "bin": {
         "katex": "cli.js"
       }
     },
+    "node_modules/katex/node_modules/commander": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
+      "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/killable": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/killable/-/killable-1.0.1.tgz",
@@ -10535,9 +10556,9 @@
       }
     },
     "node_modules/marked": {
-      "version": "0.8.0",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-0.8.0.tgz",
-      "integrity": "sha512-MyUe+T/Pw4TZufHkzAfDj6HarCBWia2y27/bhuYkTaiUnfDYFnCP3KUN+9oM7Wi6JA2rymtVYbQu3spE0GCmxQ==",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-2.0.3.tgz",
+      "integrity": "sha512-5otztIIcJfPc2qGTN8cVtOJEjNJZ0jwa46INMagrYfk0EvqtRuEHLsEe0LrFS0/q+ZRKT0+kXK7P2T1AN5lWRA==",
       "bin": {
         "marked": "bin/marked"
       },
@@ -11177,6 +11198,11 @@
       "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
       "dev": true
     },
+    "node_modules/naughty-words": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/naughty-words/-/naughty-words-1.2.0.tgz",
+      "integrity": "sha512-0iadX6fN+3NsfvIRtWmmpEX9VsoIQ6n9FwyIxmew9w5yzFNqMgs/Ky0eAC/z5xXSHtqlVoByiovdROikwH9SXQ=="
+    },
     "node_modules/needle": {
       "version": "2.6.0",
       "resolved": "https://registry.npmjs.org/needle/-/needle-2.6.0.tgz",
@@ -11242,14 +11268,23 @@
       }
     },
     "node_modules/ngx-markdown": {
-      "version": "9.0.0",
-      "resolved": "https://registry.npmjs.org/ngx-markdown/-/ngx-markdown-9.0.0.tgz",
-      "integrity": "sha512-wcXMxA4Skgk9SzhfDRjihap/Kjq17jmMQiE/Ccp0bNibGaDgS5DbZiPBlMNLkp669UvjY9wVuxE4NuDtmQHS9w==",
+      "version": "11.1.3",
+      "resolved": "https://registry.npmjs.org/ngx-markdown/-/ngx-markdown-11.1.3.tgz",
+      "integrity": "sha512-z32q8l76ubrcP62L03mdvrizwueLBHV10LkT8MEDnFcjmY+8J1PytxFJ9EBTJpvc+CaPolgAoi7felN2XJZTSg==",
       "dependencies": {
-        "@types/marked": "^0.7.2",
-        "katex": "^0.11.0",
-        "marked": "^0.8.0",
-        "prismjs": "^1.16.0"
+        "@types/marked": "^2.0.0",
+        "emoji-toolkit": "^6.0.1",
+        "katex": "^0.13.0",
+        "marked": "^2.0.0",
+        "prismjs": "^1.23.0",
+        "tslib": "^2.0.0"
+      },
+      "peerDependencies": {
+        "@angular/common": "^11.0.0",
+        "@angular/core": "^11.0.0",
+        "@angular/platform-browser": "^11.0.0",
+        "rxjs": "^6.6.0",
+        "zone.js": "^0.10.2 || ^0.11.3"
       }
     },
     "node_modules/ngx-matomo": {
@@ -23438,9 +23473,9 @@
       "dev": true
     },
     "clipboard": {
-      "version": "2.0.8",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.8.tgz",
-      "integrity": "sha512-Y6WO0unAIQp5bLmk1zdThRhgJt/x3ks6f30s3oE3H1mgIEU33XyQjEf8gsf6DxC7NPX8Y1SsNWjUjL/ywLnnbQ==",
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.4.tgz",
+      "integrity": "sha512-Vw26VSLRpJfBofiVaFb/I8PVfdI1OxKcYShe6fm0sP/DtmiWQNCjhM/okTvdCo0G+lMMm1rMYbk4IK4x1X+kgQ==",
       "optional": true,
       "requires": {
         "good-listener": "^1.2.2",
diff --git a/src/app/components/shared/header/header.component.html b/src/app/components/shared/header/header.component.html
index 6184ca014676f48aed356782fb14c9ad409a02e3..11f0ef435ef23c65af39373dbae244724787eb71 100644
--- a/src/app/components/shared/header/header.component.html
+++ b/src/app/components/shared/header/header.component.html
@@ -18,7 +18,7 @@
 
 
     <ng-container *ngIf="room && room.closed">
-      <h1>{{'header.questions-blocked'|translate}}</h1>
+      <mat-icon>block</mat-icon><h1>{{'header.questions-blocked'|translate}}</h1>
     </ng-container>
 
     <ars-style-btn-material
@@ -348,7 +348,7 @@
         <span>{{'header.delete-account' | translate}}</span>
       </button>
 
-      <ng-container *ngIf="shortId && user && user.role > 0">
+      <ng-container *ngIf="shortId && user && user.role > 0 && !router.url.includes('/participant')">
         <button mat-menu-item
                 (click)="blockQuestions()"
                 [ngClass]="{'color-warn': room.closed}"
diff --git a/src/app/components/shared/header/header.component.scss b/src/app/components/shared/header/header.component.scss
index c36df0f777a8529ab3e3e983094459b11295425b..a6e4125f8ccaefefcaa5a7f435a7632a5452948b 100644
--- a/src/app/components/shared/header/header.component.scss
+++ b/src/app/components/shared/header/header.component.scss
@@ -120,4 +120,4 @@ svg {
 }
 h1{
   color: red;
-}
\ No newline at end of file
+}
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.html b/src/app/components/shared/questionwall/question-wall/question-wall.component.html
index e4bfc4f2e959fb31d928027c15fa373ef57a6281..baf41d2806b86563bd2b74f3e7f757f58b5cc305 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.html
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.html
@@ -6,6 +6,10 @@
           <button ars-btn (click)="leave()" matRipple aria-labelledby="back-lbl"><i>arrow_back</i></button>
         </ars-col>
       </ars-fill>
+      <ng-container *ngIf="room && room.closed">
+        <mat-icon>block</mat-icon>
+        <h2>{{'question-wall.questions-blocked'|translate}}</h2>
+      </ng-container>
       <ars-col>
         <!-- centered col -->
       </ars-col>
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
index df024156e568c7d7ce0bf2726e503f730ddb5f0c..4379b12598a8474c22d0e34544323e98a731509e 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
@@ -302,3 +302,6 @@
 .selection:focus{
   background-color: black !important;
 }
+h2{
+  color: red;
+}
diff --git a/src/assets/i18n/participant/de.json b/src/assets/i18n/participant/de.json
index f82fa30c7e299e1c96e95d9223eef07e1871b3ae..91ec776c5a09f4b3c731a7df6cf53ad951b322a2 100644
--- a/src/assets/i18n/participant/de.json
+++ b/src/assets/i18n/participant/de.json
@@ -222,7 +222,8 @@
     "prev-comment-lbl": "Vorherige Frage",
     "next-comment-lbl": "Nächste Frage",
     "overview-question-tooltip": "Anzahl gestellter Fragen",
-    "overview-questioners-tooltip": "Anzahl Fragensteller*innen"
+    "overview-questioners-tooltip": "Anzahl Fragensteller*innen",
+    "questions-blocked": "Fragen sind deaktiviert!"
   },
   "tag-cloud": {
     "config": "Wolkenansicht ändern",
diff --git a/src/assets/i18n/participant/en.json b/src/assets/i18n/participant/en.json
index 66531c05ea3c932889bfea80c4e918f52f642229..3945272ecbfe33e5f2e487b5c4eefe473d4e3f31 100644
--- a/src/assets/i18n/participant/en.json
+++ b/src/assets/i18n/participant/en.json
@@ -227,7 +227,8 @@
     "prev-comment-lbl": "Previous question",
     "next-comment-lbl": "Next question",
     "overview-question-tooltip": "Number of questions",
-    "overview-questioners-tooltip": "Number of questioners"
+    "overview-questioners-tooltip": "Number of questioners",
+    "questions-blocked": "No further questions!"
   },
   "tag-cloud": {
     "config": "Modify cloud view",