diff --git a/pyplayready/__init__.py b/pyplayready/__init__.py
index c54646c..7a4435e 100644
--- a/pyplayready/__init__.py
+++ b/pyplayready/__init__.py
@@ -11,4 +11,4 @@ from pyplayready.system.pssh import *
 from pyplayready.system.session import *
 
 
-__version__ = "0.4.4"
+__version__ = "0.4.5"
diff --git a/pyplayready/crypto/ecc_key.py b/pyplayready/crypto/ecc_key.py
index 01c497c..2baab46 100644
--- a/pyplayready/crypto/ecc_key.py
+++ b/pyplayready/crypto/ecc_key.py
@@ -68,11 +68,18 @@ class ECCKey:
         path.parent.mkdir(parents=True, exist_ok=True)
         path.write_bytes(self.dumps(private_only))
 
+    @staticmethod
+    def _to_bytes(n: int) -> bytes:
+        byte_len = (n.bit_length() + 7) // 8
+        if byte_len % 2 != 0:
+            byte_len += 1
+        return n.to_bytes(byte_len, 'big')
+
     def get_point(self, curve: Curve) -> Point:
         return Point(self.key.pointQ.x, self.key.pointQ.y, curve)
 
     def private_bytes(self) -> bytes:
-        return self.key.d.to_bytes()
+        return self._to_bytes(int(self.key.d))
 
     def private_sha256_digest(self) -> bytes:
         hash_object = SHA256.new()
@@ -80,7 +87,7 @@ class ECCKey:
         return hash_object.digest()
 
     def public_bytes(self) -> bytes:
-        return self.key.pointQ.x.to_bytes() + self.key.pointQ.y.to_bytes()
+        return self._to_bytes(int(self.key.pointQ.x)) + self._to_bytes(int(self.key.pointQ.y))
 
     def public_sha256_digest(self) -> bytes:
         hash_object = SHA256.new()
diff --git a/pyproject.toml b/pyproject.toml
index a817d52..3f725d3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "pyplayready"
-version = "0.4.4"
+version = "0.4.5"
 description = "pyplayready CDM (Content Decryption Module) implementation in Python."
 license = "CC BY-NC-ND 4.0"
 authors = ["DevLARLEY, Erevoc", "DevataDev"]