diff --git a/poetry.lock b/poetry.lock
index 63df4d1..ad1c179 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -878,6 +878,24 @@ files = [
     {file = "mkdocs_material_extensions-1.3.1.tar.gz", hash = "sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443"},
 ]
 
+[[package]]
+name = "mkdocs-redirects"
+version = "1.2.1"
+description = "A MkDocs plugin for dynamic page redirects to prevent broken links."
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "mkdocs-redirects-1.2.1.tar.gz", hash = "sha256:9420066d70e2a6bb357adf86e67023dcdca1857f97f07c7fe450f8f1fb42f861"},
+]
+
+[package.dependencies]
+mkdocs = ">=1.1.1"
+
+[package.extras]
+dev = ["autoflake", "black", "isort", "pytest", "twine (>=1.13.0)"]
+release = ["twine (>=1.13.0)"]
+test = ["autoflake", "black", "isort", "pytest"]
+
 [[package]]
 name = "mkdocstrings"
 version = "0.24.0"
@@ -1663,4 +1681,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10 || ^3.11 || ^3.12"
-content-hash = "3f27e66de6ea095d7574340c1233c4c5ff13409f22d3dcb2a43829acd676be30"
+content-hash = "c924e8fe91a0f44fcf92650121e78da99f0e079cb9b500b0983bebc5d0dacb0c"
diff --git a/pyproject.toml b/pyproject.toml
index c0339bd..4b2fda1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ mkdocstrings = {extras = ["python"], version = "0.24.0"}
 mkdocs-git-authors-plugin = "0.7.2"
 mkdocs-git-revision-date-localized-plugin = "1.2.2"
 mkdocs-material = {extras = ["imaging"], version = "^9.5.2"}
+mkdocs-redirects = "^1.2.1"
 
 [build-system]
 requires = ["poetry-core"]
diff --git a/pyzipline/rest_adapter.py b/pyzipline/rest_adapter.py
index e5c4c57..143a3a6 100644
--- a/pyzipline/rest_adapter.py
+++ b/pyzipline/rest_adapter.py
@@ -65,7 +65,11 @@ class RestAdapter:
         try: # Deserialize JSON output to Python object, or return failed Result on exception
             data_out = response.json()
         except (ValueError, JSONDecodeError) as e:
-            raise PyZiplineError("Could not decode response from Zipline server") from e
+            if response.headers.get('Content-Type') == 'application/octet-stream':
+                # If the response contains a valid file, return success Result with file content
+                return Result(success=True, status_code=response.status_code, message=response.reason, data=response.content)
+            else:
+                raise PyZiplineError("Could not decode response from Zipline server") from e
 
         # If status_code in 200-299 range, return success Result with data, otherwise return failed Result with message
         is_success = 299 >= response.status_code >= 200
diff --git a/pyzipline/zipline.py b/pyzipline/zipline.py
index fc301a3..58099a9 100644
--- a/pyzipline/zipline.py
+++ b/pyzipline/zipline.py
@@ -182,7 +182,6 @@ class ZiplineApi:
             Forbidden: Raised if the authenticated user is not an administrator
             NotFound: Raised if the invite code does not exist
             PyZiplineError: Raised if the API changes, causing a breaking change in this method
-            ValueError: Raised if the invite code is not provided
 
         Returns:
             Invite: An object containing the deleted invite
@@ -192,8 +191,8 @@ class ZiplineApi:
             return Invite(**result.data)
         if result.message == 'invite not found':
             raise NotFound(result.message)
-        if result.message == 'no code':
-            raise ValueError('invite code not provided')
+        if result.message == 'not an administrator':
+            raise Forbidden(result.message)
         raise PyZiplineError(f"{result.status_code}: {result.message}\n{result.data}")
 
     def get_exif(self, file_id: int) -> dict:
@@ -258,6 +257,30 @@ class ZiplineApi:
         if result.status_code == 401:
             raise Forbidden(result.message)
 
+    def get_password_protected_file(self, file_id: int, password: str) -> bytes:
+        """Get a password protected file
+
+        Args:
+            file_id (int): ID of the file to get
+            password (str): Password for the file
+
+        Raises:
+            Forbidden: The password is incorrect
+            NotFound: The file does not exist
+            PyZiplineError: Raised if the API changes, causing a breaking change in this method
+
+        Returns:
+            bytes: The file, in bytes
+        """
+        result: Result = self._rest_adapter.get(endpoint=f"auth/image", params={'id': file_id, 'password': password})
+        if result.status_code == 200:
+            return result.data
+        if result.message == 'image not found':
+            raise NotFound(result.message)
+        if result.message == 'wrong password':
+            raise Forbidden(result.message)
+        raise PyZiplineError(f"{result.status_code}: {result.message}\n{result.data}")
+
     def get_invites(self) -> list[Invite]:
         """Get a list of invites