diff --git a/packages/fcl-base/src/fpthreadpool.pp b/packages/fcl-base/src/fpthreadpool.pp
index d8e70ace42..c2c748e986 100644
--- a/packages/fcl-base/src/fpthreadpool.pp
+++ b/packages/fcl-base/src/fpthreadpool.pp
@@ -1,3 +1,18 @@
+{
+    This file is part of the Free Component Library (FCL)
+    Copyright (c) 1999-2000 by Free Pascal team.
+
+    A threadpool class.
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    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.
+
+ **********************************************************************}
+
 {$IFNDEF FPC_DOTTEDUNITS}
  unit fpthreadpool;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-db/src/dbase/dbf_common.pas b/packages/fcl-db/src/dbase/dbf_common.pas
index 008a9acc4f..e38cd9c437 100644
--- a/packages/fcl-db/src/dbase/dbf_common.pas
+++ b/packages/fcl-db/src/dbase/dbf_common.pas
@@ -1,3 +1,18 @@
+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 1999-2022 by Pascal Ganaye,Micha Nelissen and other members of the
+    Free Pascal development team
+
+    DBF common functions and constants.
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    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.
+
+ **********************************************************************}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit dbf_common;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-db/src/sqldb/sqldbpool.pp b/packages/fcl-db/src/sqldb/sqldbpool.pp
index 4a7c705475..72e7f82f68 100644
--- a/packages/fcl-db/src/sqldb/sqldbpool.pp
+++ b/packages/fcl-db/src/sqldb/sqldbpool.pp
@@ -1,3 +1,17 @@
+{
+    This file is part of the Free Component Library (FCL)
+    Copyright (c) 1999-2000 by Free Pascal team.
+
+    A sqldb connection pooling class framework
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    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.
+
+ **********************************************************************}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit sqldbpool;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-hash/src/fpasn.pp b/packages/fcl-hash/src/fpasn.pp
index 480cf6b1ab..a0f517d9e5 100644
--- a/packages/fcl-hash/src/fpasn.pp
+++ b/packages/fcl-hash/src/fpasn.pp
@@ -1,3 +1,16 @@
+{
+  This file is part of the Free Component Library.
+  Copyright (c) 2023 by the Free Pascal team.
+
+  ASN routines.
+
+  See the file COPYING.FPC, included in this distribution,
+  for details about the copyright.
+
+  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.
+}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit fpasn;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-hash/src/fpecdsa.pp b/packages/fcl-hash/src/fpecdsa.pp
index 9d21dcef27..fbe4a9ec59 100644
--- a/packages/fcl-hash/src/fpecdsa.pp
+++ b/packages/fcl-hash/src/fpecdsa.pp
@@ -1,3 +1,16 @@
+{
+  This file is part of the Free Component Library.
+  Copyright (c) 2023 by the Free Pascal team.
+
+  ECDSA elliptic encryption routines.
+
+  See the file COPYING.FPC, included in this distribution,
+  for details about the copyright.
+
+  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.
+}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit fpecdsa;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-hash/src/fppem.pp b/packages/fcl-hash/src/fppem.pp
index 453dcc0957..d441e873ce 100644
--- a/packages/fcl-hash/src/fppem.pp
+++ b/packages/fcl-hash/src/fppem.pp
@@ -1,3 +1,16 @@
+{
+  This file is part of the Free Component Library.
+  Copyright (c) 2023 by the Free Pascal team.
+
+  PEM key management
+
+  See the file COPYING.FPC, included in this distribution,
+  for details about the copyright.
+
+  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.
+}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit fppem;
 {$ENDIF FPC_DOTTEDUNITS}
diff --git a/packages/fcl-hash/src/fprsa.pas b/packages/fcl-hash/src/fprsa.pas
index 92c2bb285d..239d428590 100644
--- a/packages/fcl-hash/src/fprsa.pas
+++ b/packages/fcl-hash/src/fprsa.pas
@@ -1,3 +1,16 @@
+{
+  This file is part of the Free Component Library.
+  Copyright (c) 2023 by the Free Pascal team.
+
+  RSA routines.
+
+  See the file COPYING.FPC, included in this distribution,
+  for details about the copyright.
+
+  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.
+}
 {$IFNDEF FPC_DOTTEDUNITS}
 unit fprsa;
 {$ENDIF FPC_DOTTEDUNITS}