diff --git a/Casks/nodebox.rb b/Casks/nodebox.rb
index 1b00e952f5c..0751152e9bc 100644
--- a/Casks/nodebox.rb
+++ b/Casks/nodebox.rb
@@ -5,7 +5,7 @@ cask :v1 => 'nodebox' do
   url "https://secure.nodebox.net/downloads/NodeBox-#{version}.zip"
   name 'NodeBox'
   homepage 'https://www.nodebox.net/node/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gpl
 
   app 'NodeBox.app'
 end
diff --git a/Casks/nomachine.rb b/Casks/nomachine.rb
index eefd7ec7b19..bd136c9d69b 100644
--- a/Casks/nomachine.rb
+++ b/Casks/nomachine.rb
@@ -5,7 +5,7 @@ cask :v1 => 'nomachine' do
   url "http://download.nomachine.com/download/#{version.split('.')[0..1].join('.')}/MacOSX/nomachine_#{version}.dmg"
   name 'NoMachine'
   homepage 'https://www.nomachine.com/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   pkg 'NoMachine.pkg'
   # a launchctl job ordinarily manages uninstall once the app bundle is removed
diff --git a/Casks/nothing-to-hide.rb b/Casks/nothing-to-hide.rb
index 1f669e0e44f..4bb3974a82b 100644
--- a/Casks/nothing-to-hide.rb
+++ b/Casks/nothing-to-hide.rb
@@ -6,7 +6,7 @@ cask :v1 => 'nothing-to-hide' do
   url 'https://nothingtohide.s3.amazonaws.com/pc/Nothing_To_Hide_MAC.zip'
   name 'Nothing To Hide'
   homepage 'http://back.nothingtohide.cc/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :cc
 
   app 'Nothing To Hide.app'
 end
diff --git a/Casks/nottingham.rb b/Casks/nottingham.rb
index ac280a56676..306d5964706 100644
--- a/Casks/nottingham.rb
+++ b/Casks/nottingham.rb
@@ -7,7 +7,7 @@ cask :v1 => 'nottingham' do
   appcast 'https://shine.clickontyler.com/appcast.php?id=11',
           :sha256 => '77be52d9c62393c316d5f6a5ac10f72579e31189dd08447b2f42e1f81736979d'
   homepage 'https://clickontyler.com/nottingham/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'Nottingham.app'
 end
diff --git a/Casks/ntfsmounter.rb b/Casks/ntfsmounter.rb
index b1ef5df54c8..765e7bbc3c1 100644
--- a/Casks/ntfsmounter.rb
+++ b/Casks/ntfsmounter.rb
@@ -5,7 +5,7 @@ cask :v1 => 'ntfsmounter' do
   url "http://ntfsmounter.com/NTFS%20Mounter%20#{version}.dmg.zip"
   name 'NTFS Mounter'
   homepage 'http://ntfsmounter.com/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   container :nested => "NTFS Mounter #{version}.dmg"
   app 'ntfsMounter.app'
diff --git a/Casks/nutstore.rb b/Casks/nutstore.rb
index 15607582362..66f64ba7de3 100644
--- a/Casks/nutstore.rb
+++ b/Casks/nutstore.rb
@@ -5,7 +5,7 @@ cask :v1 => 'nutstore' do
   url 'https://jianguoyun.com/static/exe/installer/NutstoreOSXInstaller.dmg'
   name 'Nutstore'
   homepage 'https://jianguoyun.com'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'Nutstore.app'
 end
diff --git a/Casks/nvalt.rb b/Casks/nvalt.rb
index 3d931ab6017..d8058b7ca13 100644
--- a/Casks/nvalt.rb
+++ b/Casks/nvalt.rb
@@ -8,7 +8,7 @@ cask :v1 => 'nvalt' do
   appcast 'http://abyss.designheresy.com/nvalt2/nvalt2main.xml',
           :sha256 => '46ab145d41812854224a0341afa320e672ea53348abe61ce08ecf84326b1b2c4'
   homepage 'http://brettterpstra.com/project/nvalt/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :bsd
 
   app 'nvALT.app'
 
diff --git a/Casks/nzbvortex.rb b/Casks/nzbvortex.rb
index 37e9aee6ea4..c5054d4efed 100644
--- a/Casks/nzbvortex.rb
+++ b/Casks/nzbvortex.rb
@@ -6,7 +6,7 @@ cask :v1 => 'nzbvortex' do
   appcast 'http://www.nzbvortex.com/update/appcast.xml'
   name 'NZBVortex'
   homepage 'http://www.nzbvortex.com/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :commercial
 
   app 'NZBVortex 3.app'
 end
diff --git a/Casks/ocenaudio.rb b/Casks/ocenaudio.rb
index 7a44775f1cc..0f3c75963e6 100644
--- a/Casks/ocenaudio.rb
+++ b/Casks/ocenaudio.rb
@@ -5,7 +5,7 @@ cask :v1 => 'ocenaudio' do
   url 'http://www.ocenaudio.com.br/downloads/ocenaudio.dmg'
   name 'ocenaudio'
   homepage 'http://www.ocenaudio.com.br/en'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'ocenaudio.app'
 end
diff --git a/Casks/octohub.rb b/Casks/octohub.rb
index 0888d16b048..78b48064305 100644
--- a/Casks/octohub.rb
+++ b/Casks/octohub.rb
@@ -6,7 +6,7 @@ cask :v1 => 'octohub' do
   url 'https://rink.hockeyapp.net/api/2/apps/8e6427d1be6e591e851b554c57a77dfc/app_versions/6?format=zip&avtoken=d9d093695c89e51fb1ae75257e7e93fefa8e8f05'
   name 'Octohub'
   homepage 'http://octohubapp.com/'
-  license :unknown
+  license :gratis
 
   app 'Octohub.app'
 
diff --git a/Casks/omnidisksweeper.rb b/Casks/omnidisksweeper.rb
index 221cf5167df..795c4e55552 100644
--- a/Casks/omnidisksweeper.rb
+++ b/Casks/omnidisksweeper.rb
@@ -5,7 +5,7 @@ cask :v1 => 'omnidisksweeper' do
   url 'https://www.omnigroup.com/download/latest/OmniDiskSweeper'
   name 'OmniDiskSweeper'
   homepage 'https://www.omnigroup.com/products/omnidisksweeper/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'OmniDiskSweeper.app'
 end
diff --git a/Casks/omniplan.rb b/Casks/omniplan.rb
index 0356f077935..172ca27f303 100644
--- a/Casks/omniplan.rb
+++ b/Casks/omniplan.rb
@@ -5,7 +5,7 @@ cask :v1 => 'omniplan' do
   url 'https://www.omnigroup.com/download/latest/omniplan'
   name 'OmniPlan'
   homepage 'https://www.omnigroup.com/omniplan/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :commercial
 
   app 'OmniPlan.app'
 end
diff --git a/Casks/omniweb.rb b/Casks/omniweb.rb
index 7930880171d..e7162a66f23 100644
--- a/Casks/omniweb.rb
+++ b/Casks/omniweb.rb
@@ -5,7 +5,7 @@ cask :v1 => 'omniweb' do
   url "https://downloads.omnigroup.com/software/MacOSX/10.4/OmniWeb-#{version}.dmg"
   name 'OmniWeb'
   homepage 'https://www.omnigroup.com/products/omniweb/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'OmniWeb.app'
 end
diff --git a/Casks/oneswarm.rb b/Casks/oneswarm.rb
index 1a6386219ed..9b97984e0a3 100644
--- a/Casks/oneswarm.rb
+++ b/Casks/oneswarm.rb
@@ -5,7 +5,7 @@ cask :v1 => 'oneswarm' do
   url 'http://www.oneswarm.org/builds/OneSwarm.dmg'
   name 'OneSwarm'
   homepage 'http://www.oneswarm.org/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gpl
 
   app 'OneSwarm.app'
 end
diff --git a/Casks/onionshare.rb b/Casks/onionshare.rb
index eed2b6b8265..95533a79a19 100644
--- a/Casks/onionshare.rb
+++ b/Casks/onionshare.rb
@@ -7,7 +7,7 @@ cask :v1 => 'onionshare' do
       :key_url => 'https://onionshare.org/signing-key.asc'
   name 'OnionShare'
   homepage 'https://onionshare.org/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gpl
 
   app 'OnionShare.app'
 end
diff --git a/Casks/oovoo.rb b/Casks/oovoo.rb
index 3b16bbc4695..39a3438bf0e 100644
--- a/Casks/oovoo.rb
+++ b/Casks/oovoo.rb
@@ -5,7 +5,7 @@ cask :v1 => 'oovoo' do
   url 'http://download.cdn.oovoo.com/download/ooVoo.dmg'
   name 'ooVoo'
   homepage 'http://www.oovoo.com'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'Oovoo.app'
 end
diff --git a/Casks/opacity.rb b/Casks/opacity.rb
index 38270a6d8c7..89cacf27e30 100644
--- a/Casks/opacity.rb
+++ b/Casks/opacity.rb
@@ -7,7 +7,7 @@ cask :v1 => 'opacity' do
   appcast 'http://downloads.likethought.com/appcasts/opacity.php',
           :sha256 => '031a196c3a9fb04b1eb31d791b154bed797a043621b8350d85eca73c113c2fe0'
   homepage 'http://likethought.com/opacity/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :commercial
 
   app 'Opacity.app'
 end
diff --git a/Casks/opendns-updater.rb b/Casks/opendns-updater.rb
index e251dba0ee2..79bcf0a514d 100644
--- a/Casks/opendns-updater.rb
+++ b/Casks/opendns-updater.rb
@@ -7,7 +7,7 @@ cask :v1 => 'opendns-updater' do
   appcast 'https://opendnsupdate.appspot.com/macupdatecheck/ipupdater/AppCast.xml',
           :sha256 => 'd5938a67e84d710e93b5e74a1b515f6881a3f0ff251bfbb5ea61ecdf1596a4a6'
   homepage 'https://support.opendns.com/entries/23218654-Where-do-I-download-an-OpenDNS-Dynamic-IP-updater-client-'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app 'OpenDNS Updater.app'
 end
diff --git a/Casks/optimal-layout.rb b/Casks/optimal-layout.rb
index 8c7f0100df5..945049e8ce1 100644
--- a/Casks/optimal-layout.rb
+++ b/Casks/optimal-layout.rb
@@ -7,7 +7,7 @@ cask :v1 => 'optimal-layout' do
   appcast 'http://most-advantageous.com/sparkle/OL-AppCast.cfm'
   name 'Optimal Layout'
   homepage 'http://most-advantageous.com/optimal-layout/'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :commercial
 
   app 'Optimal Layout.app'
 end
diff --git a/Casks/orbit.rb b/Casks/orbit.rb
index 080aaa4dc22..74544338886 100644
--- a/Casks/orbit.rb
+++ b/Casks/orbit.rb
@@ -6,7 +6,7 @@ cask :v1 => 'orbit' do
   appcast 'http://orbitapp.net/updates/appcast.xml'
   name 'Orbit'
   homepage 'http://orbitapp.net'
-  license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder
+  license :gratis
 
   app      'Orbit.app'
 end