diff --git a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CourseController.java b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CourseController.java
index f3e93d4..566121d 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CourseController.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CourseController.java
@@ -11,7 +11,6 @@ import ovh.herisson.Clyde.Services.TeacherCourseService;
 import ovh.herisson.Clyde.Tables.Course;
 import ovh.herisson.Clyde.Tables.Role;
 import ovh.herisson.Clyde.Tables.User;
-
 import java.util.HashMap;
 import java.util.Map;
 
@@ -119,4 +118,20 @@ public class CourseController {
 
         return new ResponseEntity<>(HttpStatus.OK);
     }
+
+
+    @DeleteMapping("course/{id}")
+    public ResponseEntity<String> deleteUser(@RequestHeader("Authorization") String token, @PathVariable Long id){
+        if (authServ.isNotIn(new Role[]{Role.Admin,Role.Secretary}, token))
+            return new UnauthorizedResponse<>(null);
+
+        Course toDelete = courseServ.findById(id);
+
+        if (toDelete == null)
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+
+
+        courseServ.delete(courseServ.findById(id));
+        return new ResponseEntity<>(HttpStatus.OK);
+    }
 }
diff --git a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CurriculumController.java b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CurriculumController.java
index 7a1bfe4..dda0c63 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CurriculumController.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/CurriculumController.java
@@ -67,4 +67,18 @@ public class CurriculumController {
 
         return new ResponseEntity<>(HttpStatus.OK);
     }
+
+    @DeleteMapping("/curriculum/{id}")
+    public ResponseEntity<String > deleteCurriculum(@RequestHeader("Authorization") String token, @PathVariable Long id){
+        if (authServ.isNotIn(new Role[]{Role.Admin,Role.Secretary}, token))
+            return new UnauthorizedResponse<>(null);
+
+        Curriculum toDelete = curriculumServ.findById(id);
+
+        if (toDelete == null)
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+
+        curriculumServ.delete(toDelete);
+        return new ResponseEntity<>(HttpStatus.OK);
+    }
 }
diff --git a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/InscriptionController.java b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/InscriptionController.java
index 37312d3..c70e4df 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/InscriptionController.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/InscriptionController.java
@@ -10,8 +10,6 @@ import ovh.herisson.Clyde.Services.ProtectionService;
 import ovh.herisson.Clyde.Tables.InscriptionRequest;
 import ovh.herisson.Clyde.Tables.RequestState;
 import ovh.herisson.Clyde.Tables.Role;
-import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.Map;
 
 @RestController
@@ -68,4 +66,18 @@ public class InscriptionController {
 
         return new ResponseEntity<>(HttpStatus.OK);
     }
+    @DeleteMapping("/request/register/{id}")
+    public ResponseEntity<String > deleteRequest(@RequestHeader("Authorization") String token, @PathVariable Long id){
+        if (authServ.isNotIn(new Role[]{Role.Admin,Role.InscriptionService}, token))
+            return new UnauthorizedResponse<>(null);
+
+        InscriptionRequest toDelete = inscriptionServ.getById(id);
+
+        if (toDelete == null)
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+
+        inscriptionServ.delete(toDelete);
+        return new ResponseEntity<>(HttpStatus.OK);
+    }
+
 }
diff --git a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/UserController.java b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/UserController.java
index 859bf54..3ebf67a 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/EndPoints/UserController.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/EndPoints/UserController.java
@@ -127,7 +127,12 @@ public class UserController {
         if (authServ.isNotIn(new Role[]{Role.Admin,Role.Secretary},token))
             return new UnauthorizedResponse<>(null);
 
-        userService.delete(userService.getUserById(id));
+        User toDelete = userService.getUserById(id);
+
+        if (toDelete == null)
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+
+        userService.delete(toDelete);
         return new ResponseEntity<>(HttpStatus.OK);
     }
 }
\ No newline at end of file
diff --git a/backend/src/main/java/ovh/herisson/Clyde/Services/CourseService.java b/backend/src/main/java/ovh/herisson/Clyde/Services/CourseService.java
index b5dd906..d17c7b0 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/Services/CourseService.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/Services/CourseService.java
@@ -77,4 +77,7 @@ public class CourseService {
         return true;
     }
 
+    public void delete(Course course) {
+        courseRepo.delete(course);
+    }
 }
diff --git a/backend/src/main/java/ovh/herisson/Clyde/Services/CurriculumService.java b/backend/src/main/java/ovh/herisson/Clyde/Services/CurriculumService.java
index 0c9dc42..af04d78 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/Services/CurriculumService.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/Services/CurriculumService.java
@@ -19,4 +19,7 @@ public class CurriculumService {
         return curriculumRepo.findById(id);
     }
 
+    public void delete(Curriculum curriculum) {
+        curriculumRepo.delete(curriculum);
+    }
 }
\ No newline at end of file
diff --git a/backend/src/main/java/ovh/herisson/Clyde/Services/InscriptionService.java b/backend/src/main/java/ovh/herisson/Clyde/Services/InscriptionService.java
index 7ae6e74..311dbf2 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/Services/InscriptionService.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/Services/InscriptionService.java
@@ -87,4 +87,8 @@ public class InscriptionService {
         save(inscrRequest);
         return true;
     }
+
+    public void delete(InscriptionRequest toDelete) {
+        inscriptionRepo.delete(toDelete);
+    }
 }
diff --git a/backend/src/main/java/ovh/herisson/Clyde/Services/ProtectionService.java b/backend/src/main/java/ovh/herisson/Clyde/Services/ProtectionService.java
index 6c300ba..44e53a7 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/Services/ProtectionService.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/Services/ProtectionService.java
@@ -15,6 +15,10 @@ public class ProtectionService {
      * @return all the user data without the password
      */
     public static HashMap<String,Object> userWithoutPassword(User user){
+
+        if (user ==null)
+            return null;
+
         HashMap<String,Object> toReturn = new HashMap<>();
 
         toReturn.put("regNo",user.getRegNo());
@@ -42,6 +46,9 @@ public class ProtectionService {
 
 
     public static HashMap<String,Object> courseWithoutPassword(Course course){
+        if (course == null)
+            return null;
+
         HashMap<String ,Object> toReturn = new HashMap<>();
 
         toReturn.put("courseId",course.getCourseID());
@@ -64,6 +71,10 @@ public class ProtectionService {
 
 
     public static Map<String, Object> requestWithoutPassword(InscriptionRequest inscriptionRequest) {
+
+        if (inscriptionRequest == null)
+            return null;
+
         Map<String, Object> toReturn = new HashMap<>();
 
         toReturn.put("id", inscriptionRequest.getId());
diff --git a/backend/src/main/java/ovh/herisson/Clyde/Tables/Course.java b/backend/src/main/java/ovh/herisson/Clyde/Tables/Course.java
index e338d7d..df0421d 100644
--- a/backend/src/main/java/ovh/herisson/Clyde/Tables/Course.java
+++ b/backend/src/main/java/ovh/herisson/Clyde/Tables/Course.java
@@ -1,6 +1,8 @@
 package ovh.herisson.Clyde.Tables;
 
 import jakarta.persistence.*;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
 
 @Entity
 public class Course {
@@ -11,6 +13,7 @@ public class Course {
     private String title;
 
     @ManyToOne(fetch = FetchType.EAGER)
+    @OnDelete(action = OnDeleteAction.SET_NULL)
     @JoinColumn(name = "Users")
     private User owner;