diff --git a/pkgs/servers/samba/3.x.nix b/pkgs/servers/samba/3.x.nix
index 4d9fc46dcf7..1f432c18988 100644
--- a/pkgs/servers/samba/3.x.nix
+++ b/pkgs/servers/samba/3.x.nix
@@ -87,10 +87,11 @@ stdenv.mkDerivation rec {
     '' # */
     + stdenv.lib.optionalString (configDir == "") "touch $out/lib/smb.conf";
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://www.samba.org/;
     description = "The standard Windows interoperability suite of programs for Linux and Unix";
-    platforms = stdenv.lib.platforms.linux;
+    platforms = platforms.linux;
+    license = licenses.gpl3;
     knownVulnerabilities = [
       "Numerous CVEs and no patches from upstream for 3.x since 2014."
     ];
diff --git a/pkgs/servers/sql/mysql/5.5.x.nix b/pkgs/servers/sql/mysql/5.5.x.nix
index 15f82a90208..36f5200d43b 100644
--- a/pkgs/servers/sql/mysql/5.5.x.nix
+++ b/pkgs/servers/sql/mysql/5.5.x.nix
@@ -69,9 +69,14 @@ self = stdenv.mkDerivation rec {
     mysqlVersion = "5.5";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://www.mysql.com/;
     description = "The world's most popular open source database";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    # See https://downloads.mysql.com/docs/licenses/mysqld-5.5-gpl-en.pdf
+    license = with licenses; [
+      artistic1 bsd0 bsd2 bsd3 bsdOriginal
+      gpl2 lgpl2 lgpl21 mit publicDomain  licenses.zlib
+    ];
   };
 }; in self
diff --git a/pkgs/servers/sql/mysql/5.7.x.nix b/pkgs/servers/sql/mysql/5.7.x.nix
index b5912dd9ab9..51fca399759 100644
--- a/pkgs/servers/sql/mysql/5.7.x.nix
+++ b/pkgs/servers/sql/mysql/5.7.x.nix
@@ -75,9 +75,13 @@ self = stdenv.mkDerivation rec {
     mysqlVersion = "5.7";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://www.mysql.com/;
     description = "The world's most popular open source database";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = with licenses; [
+      artistic1 bsd0 bsd2 bsd3 bsdOriginal
+      gpl2 lgpl2 lgpl21 mit publicDomain licenses.zlib
+    ];
   };
 }; in self
diff --git a/pkgs/servers/sql/postgresql/pgtap/default.nix b/pkgs/servers/sql/postgresql/pgtap/default.nix
index 2f37d3a85d3..6386049be39 100644
--- a/pkgs/servers/sql/postgresql/pgtap/default.nix
+++ b/pkgs/servers/sql/postgresql/pgtap/default.nix
@@ -28,5 +28,6 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ willibutz ];
     homepage = https://pgtap.org;
     inherit (postgresql.meta) platforms;
+    license = licenses.mit;
   };
 }
diff --git a/pkgs/servers/sql/virtuoso/6.x.nix b/pkgs/servers/sql/virtuoso/6.x.nix
index eda1f060df2..0daf7533a60 100644
--- a/pkgs/servers/sql/virtuoso/6.x.nix
+++ b/pkgs/servers/sql/virtuoso/6.x.nix
@@ -40,6 +40,6 @@ stdenv.mkDerivation rec {
     description = "SQL/RDF database used by, e.g., KDE-nepomuk";
     homepage = http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/;
     platforms = platforms.linux;
-    maintainers = [ ];
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/servers/sql/virtuoso/7.x.nix b/pkgs/servers/sql/virtuoso/7.x.nix
index 536e96354d9..17ec49d1613 100644
--- a/pkgs/servers/sql/virtuoso/7.x.nix
+++ b/pkgs/servers/sql/virtuoso/7.x.nix
@@ -31,6 +31,6 @@ stdenv.mkDerivation rec {
     homepage = http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/;
     #configure: The current version [...] can only be built on 64bit platforms
     platforms = [ "x86_64-linux" ];
-    maintainers = [ ];
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/servers/xmpp/pyIRCt/default.nix b/pkgs/servers/xmpp/pyIRCt/default.nix
index ebdc73aec30..535fb061de9 100644
--- a/pkgs/servers/xmpp/pyIRCt/default.nix
+++ b/pkgs/servers/xmpp/pyIRCt/default.nix
@@ -34,8 +34,9 @@ stdenv.mkDerivation rec {
     wrapPythonPrograms
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "IRC transport module for XMPP";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/servers/xmpp/pyMAILt/default.nix b/pkgs/servers/xmpp/pyMAILt/default.nix
index aeed7484f82..b1c4d93f687 100644
--- a/pkgs/servers/xmpp/pyMAILt/default.nix
+++ b/pkgs/servers/xmpp/pyMAILt/default.nix
@@ -32,8 +32,9 @@ stdenv.mkDerivation rec {
     wrapPythonPrograms
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Email transport module for XMPP";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/shells/dash/default.nix b/pkgs/shells/dash/default.nix
index 2db8edd5e0c..f8d592748b3 100644
--- a/pkgs/shells/dash/default.nix
+++ b/pkgs/shells/dash/default.nix
@@ -10,10 +10,11 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "format" ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://gondor.apana.org.au/~herbert/dash/;
     description = "A POSIX-compliant implementation of /bin/sh that aims to be as small as possible";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = with licenses; [ bsd3 gpl2 ];
   };
 
   passthru = {
diff --git a/pkgs/tools/bluetooth/obex-data-server/default.nix b/pkgs/tools/bluetooth/obex-data-server/default.nix
index 5c272e3dbaf..5c8f65ae514 100644
--- a/pkgs/tools/bluetooth/obex-data-server/default.nix
+++ b/pkgs/tools/bluetooth/obex-data-server/default.nix
@@ -18,8 +18,9 @@ stdenv.mkDerivation rec {
   export PKG_CONFIG_PATH="${dbus.dev}/lib/pkgconfig:$PKG_CONFIG_PATH"
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://wiki.muiline.com/obex-data-server;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = platforms.linux;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/bluetooth/obexd/default.nix b/pkgs/tools/bluetooth/obexd/default.nix
index 4d872c3d9ac..0771505b726 100644
--- a/pkgs/tools/bluetooth/obexd/default.nix
+++ b/pkgs/tools/bluetooth/obexd/default.nix
@@ -1,8 +1,8 @@
 { stdenv, fetchurl, pkgconfig, glib, dbus, openobex, bluez, libical }:
-   
+
 stdenv.mkDerivation rec {
   name = "obexd-0.48";
-   
+
   src = fetchurl {
     url = "mirror://kernel/linux/bluetooth/${name}.tar.bz2";
     sha256 = "1i20dnibvnq9lnkkhajr5xx3kxlwf9q5c4jm19kyb0q1klzgzlb8";
@@ -12,8 +12,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://www.bluez.org/;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = platforms.linux;
+    license = licenses.gpl3;
   };
 }
diff --git a/pkgs/tools/typesetting/tex/lkproof/default.nix b/pkgs/tools/typesetting/tex/lkproof/default.nix
index 844eadc4440..db0ec6d9bea 100644
--- a/pkgs/tools/typesetting/tex/lkproof/default.nix
+++ b/pkgs/tools/typesetting/tex/lkproof/default.nix
@@ -2,12 +2,12 @@
 
 stdenv.mkDerivation {
   name = "lkproof-3.1";
-  
+
   src = fetchurl {
     url = http://mirror.ctan.org/macros/latex/contrib/lkproof.zip;
     sha256 = "1qjkjhpc4rm62qxn18r83zdlwnj1wvnkcpdiqlv7w4bakh0gvjly";
   };
-  
+
   buildInputs = [ unzip ];
 
   installPhase = "
@@ -15,7 +15,8 @@ stdenv.mkDerivation {
     cp -prd *.sty $out/share/texmf-nix/tex/generic/lkproof
   ";
 
-  meta = {
-    platforms = stdenv.lib.platforms.unix;
+  meta = with stdenv.lib; {
+    platforms = platforms.unix;
+    license = licenses.gpl1Plus;
   };
 }
diff --git a/pkgs/tools/typesetting/tex/pgf/1.x.nix b/pkgs/tools/typesetting/tex/pgf/1.x.nix
index de5ef2abccf..9215a1e0ac4 100644
--- a/pkgs/tools/typesetting/tex/pgf/1.x.nix
+++ b/pkgs/tools/typesetting/tex/pgf/1.x.nix
@@ -15,8 +15,9 @@ stdenv.mkDerivation {
     cp -prd * $out/share/texmf-nix
   ";
 
-  meta = {
+  meta = with stdenv.lib; {
     branch = "1";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/typesetting/tex/pgf/2.x.nix b/pkgs/tools/typesetting/tex/pgf/2.x.nix
index cb8d2dbdf48..56e50e44408 100644
--- a/pkgs/tools/typesetting/tex/pgf/2.x.nix
+++ b/pkgs/tools/typesetting/tex/pgf/2.x.nix
@@ -15,8 +15,9 @@ stdenv.mkDerivation {
     cp -prd * $out/share/texmf-nix
   ";
 
-  meta = {
+  meta = with stdenv.lib; {
     branch = "2";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/typesetting/tex/pgf/3.x.nix b/pkgs/tools/typesetting/tex/pgf/3.x.nix
index 28225ebf28a..0835c7c547d 100644
--- a/pkgs/tools/typesetting/tex/pgf/3.x.nix
+++ b/pkgs/tools/typesetting/tex/pgf/3.x.nix
@@ -24,8 +24,9 @@ stdenv.mkDerivation {
     cp -prd * $out/share/texmf-nix
   ";
 
-  meta = {
+  meta = with stdenv.lib; {
     branch = "3";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/typesetting/tex/pgfplots/default.nix b/pkgs/tools/typesetting/tex/pgfplots/default.nix
index 2fe3daee699..fcdebedb7d8 100644
--- a/pkgs/tools/typesetting/tex/pgfplots/default.nix
+++ b/pkgs/tools/typesetting/tex/pgfplots/default.nix
@@ -19,7 +19,10 @@ stdenv.mkDerivation {
     cp -prd * $out/share/texmf-nix
   ";
 
-  meta = {
-    platforms = stdenv.lib.platforms.unix;
+  meta = with stdenv.lib; {
+    description = "TeX package to draw plots directly in TeX in two and three dimensions";
+    homepage = http://pgfplots.sourceforge.net;
+    platforms = platforms.unix;
+    license = licenses.gpl3Plus;
   };
 }