add AGPL license to folder

signature/LICENSE

@@ -0,0 +1,3 @@
+All files within the `/signature/` directory are licensed under the GNU Affero General Public License as published by the Free Software Foundation.
+
+See <http://www.gnu.org/licenses/> for a copy of the license text.

signature/auth-types.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-// ref: https://github.com/minio/minio/cmd/auth-handler.go
+// ref: https://github.com/minio/minio/master/cmd/auth-handler.go
 
 type authType int
 

signature/signature-v4.go

@@ -15,7 +15,7 @@ import (
 	"time"
 )
 
-// ref: https://github.com/minio/minio/cmd/auth-handler.go
+// ref: https://github.com/minio/minio/master/cmd/auth-handler.go
 
 const (
 	iso8601Format  = "20060102T150405Z"

signature/streaming-signature-v4.go

@@ -1,24 +1,6 @@
 package signature
 
-// Copyright (c) 2015-2021 MinIO, Inc.
-//
-// This file is part of MinIO Object Storage stack
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-// Package cmd This file implements helper functions to validate Streaming AWS
-// Signature Version '4' authorization header.
+// ref: https://github.com/minio/minio/blob/master/cmd/streaming-signature-v4.go
 
 import (
 	"bufio"