diff --git a/app/controllers/api/LICENSE b/app/controllers/api/LICENSE
deleted file mode 100644
index de7a5345d..000000000
--- a/app/controllers/api/LICENSE
+++ /dev/null
@@ -1,19 +0,0 @@
-Copyright (c) 2012 Brian Ploetz (bploetz@gmail.com)
-
-Permission is hereby granted, free of charge, to any person obtaining a
-copy of this software and associated documentation files (the "Software"),
-to deal in the Software without restriction, including without limitation
-the rights to use, copy, modify, merge, publish, distribute, sublicense,
-and/or sell copies of the Software, and to permit persons to whom the
-Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/app/controllers/api/openid_connect/clients_controller.rb b/app/controllers/api/openid_connect/clients_controller.rb
index 66ef31cc6..0a6f7ba94 100644
--- a/app/controllers/api/openid_connect/clients_controller.rb
+++ b/app/controllers/api/openid_connect/clients_controller.rb
@@ -18,6 +18,7 @@ module Api
         validation_fail_as_json(e)
       end
 
+      # Inspired by https://github.com/nov/openid_connect_sample/blob/master/app/controllers/connect/clients_controller.rb#L24
       def create
         registrar = OpenIDConnect::Client::Registrar.new(request.url, params)
         client = Api::OpenidConnect::OAuthApplication.register! registrar
diff --git a/app/controllers/api/openid_connect/discovery_controller.rb b/app/controllers/api/openid_connect/discovery_controller.rb
index a2fe1b766..19c9001b4 100644
--- a/app/controllers/api/openid_connect/discovery_controller.rb
+++ b/app/controllers/api/openid_connect/discovery_controller.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/app/controllers/discovery_controller.rb
+
 module Api
   module OpenidConnect
     class DiscoveryController < ApplicationController
diff --git a/app/controllers/api/openid_connect/id_tokens_controller.rb b/app/controllers/api/openid_connect/id_tokens_controller.rb
index 1528b2733..26eb17bde 100644
--- a/app/controllers/api/openid_connect/id_tokens_controller.rb
+++ b/app/controllers/api/openid_connect/id_tokens_controller.rb
@@ -1,3 +1,24 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
 module Api
   module OpenidConnect
     class IdTokensController < ApplicationController
diff --git a/app/models/api/openid_connect/authorization.rb b/app/models/api/openid_connect/authorization.rb
index fb8c006cc..f0ecef411 100644
--- a/app/models/api/openid_connect/authorization.rb
+++ b/app/models/api/openid_connect/authorization.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/app/models/authorization.rb
+
 module Api
   module OpenidConnect
     class Authorization < ActiveRecord::Base
@@ -29,6 +31,7 @@ module Api
         end
       end
 
+      # Inspired by https://github.com/nov/openid_connect_sample/blob/master/app/models/access_token.rb#L26
       def accessible?(required_scopes=nil)
         Array(required_scopes).all? { |required_scope|
           scopes.include? required_scope
diff --git a/app/models/api/openid_connect/id_token.rb b/app/models/api/openid_connect/id_token.rb
index 4b8e83137..7fdcd7af0 100644
--- a/app/models/api/openid_connect/id_token.rb
+++ b/app/models/api/openid_connect/id_token.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/app/models/id_token.rb
+
 require "uri"
 
 module Api
diff --git a/app/models/api/openid_connect/o_auth_access_token.rb b/app/models/api/openid_connect/o_auth_access_token.rb
index a62b72ad9..053bc86df 100644
--- a/app/models/api/openid_connect/o_auth_access_token.rb
+++ b/app/models/api/openid_connect/o_auth_access_token.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/app/models/access_token.rb
+
 module Api
   module OpenidConnect
     class OAuthAccessToken < ActiveRecord::Base
diff --git a/app/models/api/openid_connect/o_auth_application.rb b/app/models/api/openid_connect/o_auth_application.rb
index 6f5363669..ccceadfea 100644
--- a/app/models/api/openid_connect/o_auth_application.rb
+++ b/app/models/api/openid_connect/o_auth_application.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/app/models/client.rb
+
 require "digest"
 
 module Api
diff --git a/app/models/api/openid_connect/pairwise_pseudonymous_identifier.rb b/app/models/api/openid_connect/pairwise_pseudonymous_identifier.rb
index 4821ea1a2..7aeccc9fa 100644
--- a/app/models/api/openid_connect/pairwise_pseudonymous_identifier.rb
+++ b/app/models/api/openid_connect/pairwise_pseudonymous_identifier.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/app/models/pairwise_pseudonymous_identifier.rb
+
 module Api
   module OpenidConnect
     class PairwisePseudonymousIdentifier < ActiveRecord::Base
diff --git a/db/migrate/20150613202109_create_o_auth_applications.rb b/db/migrate/20150613202109_create_o_auth_applications.rb
index c40368622..1170b5c9e 100644
--- a/db/migrate/20150613202109_create_o_auth_applications.rb
+++ b/db/migrate/20150613202109_create_o_auth_applications.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/db/migrate/20110829023826_create_clients.rb
+
 class CreateOAuthApplications < ActiveRecord::Migration
   def change
     create_table :o_auth_applications do |t|
diff --git a/db/migrate/20150708153928_create_o_auth_access_tokens.rb b/db/migrate/20150708153928_create_o_auth_access_tokens.rb
index 5172ff7c6..d833011c5 100644
--- a/db/migrate/20150708153928_create_o_auth_access_tokens.rb
+++ b/db/migrate/20150708153928_create_o_auth_access_tokens.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/db/migrate/20110829023837_create_access_tokens.rb
+
 class CreateOAuthAccessTokens < ActiveRecord::Migration
   def change
     create_table :o_auth_access_tokens do |t|
diff --git a/db/migrate/20150714055110_create_id_tokens.rb b/db/migrate/20150714055110_create_id_tokens.rb
index 4a5af5985..b1e3abdfa 100644
--- a/db/migrate/20150714055110_create_id_tokens.rb
+++ b/db/migrate/20150714055110_create_id_tokens.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/db/migrate/20110829024010_create_id_tokens.rb
+
 class CreateIdTokens < ActiveRecord::Migration
   def change
     create_table :id_tokens do |t|
diff --git a/db/migrate/20150731123113_create_pairwise_pseudonymous_identifiers.rb b/db/migrate/20150731123113_create_pairwise_pseudonymous_identifiers.rb
index 40fc03d09..0c8690848 100644
--- a/db/migrate/20150731123113_create_pairwise_pseudonymous_identifiers.rb
+++ b/db/migrate/20150731123113_create_pairwise_pseudonymous_identifiers.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/db/migrate/20110829024140_create_pairwise_pseudonymous_identifiers.rb
+
 class CreatePairwisePseudonymousIdentifiers < ActiveRecord::Migration
   def change
     create_table :ppid do |t|
diff --git a/lib/api/openid_connect/protected_resource_endpoint.rb b/lib/api/openid_connect/protected_resource_endpoint.rb
index a64c5db45..540b69d1d 100644
--- a/lib/api/openid_connect/protected_resource_endpoint.rb
+++ b/lib/api/openid_connect/protected_resource_endpoint.rb
@@ -1,3 +1,26 @@
+# Copyright (c) 2011 nov matake
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+# See https://github.com/nov/openid_connect_sample/blob/master/lib/authentication.rb#L56
+
 module Api
   module OpenidConnect
     module ProtectedResourceEndpoint
diff --git a/lib/api/openid_connect/token_endpoint.rb b/lib/api/openid_connect/token_endpoint.rb
index 627dc6737..a2e8c8ac2 100644
--- a/lib/api/openid_connect/token_endpoint.rb
+++ b/lib/api/openid_connect/token_endpoint.rb
@@ -1,3 +1,5 @@
+# Inspired by https://github.com/nov/openid_connect_sample/blob/master/lib/token_endpoint.rb
+
 module Api
   module OpenidConnect
     class TokenEndpoint