4 files changed, 4 insertions, 4 deletions
diff --git a/pkgs/tools/cd-dvd/cdrkit/default.nix b/pkgs/tools/cd-dvd/cdrkit/default.nix
index 0d44624786b6..bcf9ec2c0cc3 100644
--- a/pkgs/tools/cd-dvd/cdrkit/default.nix
+++ b/pkgs/tools/cd-dvd/cdrkit/default.nix
@@ -36,6 +36,6 @@ stdenv.mkDerivation rec {
     '';
     
     homepage = http://cdrkit.org/;
-    license = "GPLv2";
+    license = stdenv.lib.licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/cd-dvd/unetbootin/default.nix b/pkgs/tools/cd-dvd/unetbootin/default.nix
index 39b7c8098582..516f07508072 100644
--- a/pkgs/tools/cd-dvd/unetbootin/default.nix
+++ b/pkgs/tools/cd-dvd/unetbootin/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation {
   meta = {
     homepage = http://unetbootin.sourceforge.net/;
     description = "A tool to create bootable live USB drives from ISO images";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
     platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/tools/cd-dvd/vobcopy/default.nix b/pkgs/tools/cd-dvd/vobcopy/default.nix
index fd0f131b8c2a..f181ab71edfb 100644
--- a/pkgs/tools/cd-dvd/vobcopy/default.nix
+++ b/pkgs/tools/cd-dvd/vobcopy/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   meta = {
     description = "Copies DVD .vob files to harddisk, decrypting them on the way";
     homepage = http://vobcopy.org/projects/c/c.shtml;
-    license = "GPLv2";
+    license = stdenv.lib.licenses.gpl2;
 
     maintainers = [ stdenv.lib.maintainers.bluescreen303 ];
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/tools/cd-dvd/xorriso/default.nix b/pkgs/tools/cd-dvd/xorriso/default.nix
index 62a802ebab5f..88cca66efb13 100644
--- a/pkgs/tools/cd-dvd/xorriso/default.nix
+++ b/pkgs/tools/cd-dvd/xorriso/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
          filesystems.
       '';
 
-    license = "GPLv3+";
+    license = stdenv.lib.licenses.gpl3Plus;
 
     homepage = http://www.gnu.org/software/xorriso/;