diff --git a/.gitmodules b/.gitmodules
index 72b6bb79504d968cb0c1091bca59137f6e9ebf0d..db4d7c5fb7becd1bcc7c70d056dd5a73c257e473 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -8,3 +8,6 @@
 [submodule "community/cert"]
 	path = community/cert
 	url = https://github.com/c3CERT/rc3_tiles.git
+[submodule "community/c3sign"]
+	path = community/c3sign
+	url = https://git.cccv.de/signs/rc3maptiles
diff --git a/community/c3sign b/community/c3sign
new file mode 160000
index 0000000000000000000000000000000000000000..533d2b7768444c639b4da4eb4db14e8c9c9b80e9
--- /dev/null
+++ b/community/c3sign
@@ -0,0 +1 @@
+Subproject commit 533d2b7768444c639b4da4eb4db14e8c9c9b80e9
diff --git a/community/cert b/community/cert
index 6a140dbfbf688f855ce08671c7513c106bbdc50d..71c6156d9867e06eacfeef00c9b3055ec72ae793 160000
--- a/community/cert
+++ b/community/cert
@@ -1 +1 @@
-Subproject commit 6a140dbfbf688f855ce08671c7513c106bbdc50d
+Subproject commit 71c6156d9867e06eacfeef00c9b3055ec72ae793
diff --git a/community/kalkspace b/community/kalkspace
index 6e6a4a94764ee9a07cf0543c86a2ab6001107f2c..1e5ad9d883c11536edeba3c6a0a66ca2ca82592b 160000
--- a/community/kalkspace
+++ b/community/kalkspace
@@ -1 +1 @@
-Subproject commit 6e6a4a94764ee9a07cf0543c86a2ab6001107f2c
+Subproject commit 1e5ad9d883c11536edeba3c6a0a66ca2ca82592b