diff --git a/hsmodels/schemas/fields.py b/hsmodels/schemas/fields.py
index 29c2085..e4a97dc 100644
--- a/hsmodels/schemas/fields.py
+++ b/hsmodels/schemas/fields.py
@@ -66,10 +66,13 @@ class Rights(BaseMetadata):
 
     model_config = ConfigDict(title='Rights Metadata')
 
-    statement: str = Field(
-        title="Statement", description="A string containing the text of the license or rights statement",
+    statement: Optional[str] = Field(
+        default=None,
+        title="Statement", 
+        description="A string containing the text of the license or rights statement",
     )
-    url: AnyUrl = Field(
+    url: Optional[AnyUrl] = Field(
+        default=None,
         title="URL",
         description="An object containing the URL pointing to a description of the license or rights statement",
     )
diff --git a/hsmodels/schemas/rdf/fields.py b/hsmodels/schemas/rdf/fields.py
index a7692ca..f5d8de9 100644
--- a/hsmodels/schemas/rdf/fields.py
+++ b/hsmodels/schemas/rdf/fields.py
@@ -126,8 +126,8 @@ class DateInRDF(RDFBaseModel):
 
 
 class RightsInRDF(RDFBaseModel):
-    statement: str = Field(json_schema_extra={"rdf_predicate": HSTERMS.rightsStatement})
-    url: AnyUrl = Field(json_schema_extra={"rdf_predicate": HSTERMS.URL})
+    statement: Optional[str] = Field(default=None,json_schema_extra={"rdf_predicate": HSTERMS.rightsStatement})
+    url: Optional[AnyUrl] = Field(default=None,json_schema_extra={"rdf_predicate": HSTERMS.URL})
 
 
 class CreatorInRDF(RDFBaseModel):
diff --git a/setup.py b/setup.py
index 46585f1..c4cc26f 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 
 setup(
     name='hsmodels',
-    version='1.0.4',
+    version='1.0.5',
     packages=find_packages(include=['hsmodels', 'hsmodels.*', 'hsmodels.schemas.*', 'hsmodels.schemas.rdf.*'],
                            exclude=("tests",)),
     install_requires=[