Change license of libsquashfs.so

This this commit, the code that is compiled and linked to produce
libsquashfs.so (and *only* libsquashfs.so) is released under the
terms and conditions of the GNU Lesser General Public license,
allowing 3rd party programs to dynamically link against it and still
being able to release their programs under a license of their choosing.

The libutil library is also relicensed, because it is statically linked
into libsquashfs.so. This does not affect the command line programs that
remain under the GPLv3.

At the current time, the two libraries do not contain any 3rd party
contributions and thus do not require anybodys consent other than mine
to change the licensing terms (unlike e.g. libfstree.a).

The libfstree.a and libsqfshelper.a utility libraries will also remain
under the GPLv3 license.

Going forward, some parts of libsqfshelper.a will be moved to
libsquashfs.so. The parts absorbed by libsquashfs.so will then also have
their licensing conditions changed *at that time*.

For the public headers, this commit adds the full boiler-plate comment
about the license, for the source files and internal headers, only the
SPDX identifier is changed.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

50 files changed, 409 insertions, 62 deletions

diff --git a/LICENSE b/LICENSE-gpl.txt
index f288702..f288702 100644
--- a/LICENSE
+++ b/LICENSE-gpl.txt
diff --git a/LICENSE-lgpl.txt b/LICENSE-lgpl.txt
new file mode 100644
index 0000000..0a04128
--- /dev/null
+++ b/LICENSE-lgpl.txt
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/Makefile.am b/Makefile.am
index 3c0aa18..429ad51 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,7 +11,7 @@ lib_LTLIBRARIES =
 dist_man1_MANS =
 check_PROGRAMS =
 
-EXTRA_DIST = autogen.sh LICENSE README.md CHANGELOG.md
+EXTRA_DIST = autogen.sh LICENSE-gpl.txt LICENSE-lgpl.txt README.md CHANGELOG.md
 TESTS =
 
 include doc/Makemodule.am
diff --git a/include/sqfs/block_processor.h b/include/sqfs/block_processor.h
index 1ec2f7c..70cff09 100644
--- a/include/sqfs/block_processor.h
+++ b/include/sqfs/block_processor.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * block_processor.h
+ * block_processor.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SFQS_BLOCK_PROCESSOR_H
 #define SFQS_BLOCK_PROCESSOR_H
diff --git a/include/sqfs/compress.h b/include/sqfs/compress.h
index e781e02..eaec2b5 100644
--- a/include/sqfs/compress.h
+++ b/include/sqfs/compress.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * compress.h
+ * compress.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_COMPRESS_H
 #define SQFS_COMPRESS_H
diff --git a/include/sqfs/data.h b/include/sqfs/data.h
index e8efa73..818d427 100644
--- a/include/sqfs/data.h
+++ b/include/sqfs/data.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * data.h
+ * data.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_DATA_H
 #define SQFS_DATA_H
diff --git a/include/sqfs/dir.h b/include/sqfs/dir.h
index 196d135..6bcb278 100644
--- a/include/sqfs/dir.h
+++ b/include/sqfs/dir.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * dir.h
+ * dir.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_DIR_H
 #define SQFS_DIR_H
diff --git a/include/sqfs/error.h b/include/sqfs/error.h
index 5bbf26c..a755c0b 100644
--- a/include/sqfs/error.h
+++ b/include/sqfs/error.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * error.h
+ * error.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_ERROR_H
 #define SQFS_ERROR_H
diff --git a/include/sqfs/id_table.h b/include/sqfs/id_table.h
index 6b058ae..87e13f5 100644
--- a/include/sqfs/id_table.h
+++ b/include/sqfs/id_table.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * id_table.h
+ * id_table.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_ID_TABLE_H
 #define SQFS_ID_TABLE_H
diff --git a/include/sqfs/inode.h b/include/sqfs/inode.h
index 76d1a7c..d0c49a1 100644
--- a/include/sqfs/inode.h
+++ b/include/sqfs/inode.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * inode.h
+ * inode.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_INODE_H
 #define SQFS_INODE_H
diff --git a/include/sqfs/io.h b/include/sqfs/io.h
index f290c2d..59739ec 100644
--- a/include/sqfs/io.h
+++ b/include/sqfs/io.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * io.h
+ * io.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_IO_H
 #define SQFS_IO_H
diff --git a/include/sqfs/meta_reader.h b/include/sqfs/meta_reader.h
index 00a6d65..1a9e869 100644
--- a/include/sqfs/meta_reader.h
+++ b/include/sqfs/meta_reader.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * meta_reader.h
+ * meta_reader.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_META_READER_H
 #define SQFS_META_READER_H
diff --git a/include/sqfs/meta_writer.h b/include/sqfs/meta_writer.h
index 3b255f2..b3da355 100644
--- a/include/sqfs/meta_writer.h
+++ b/include/sqfs/meta_writer.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * meta_writer.h
+ * meta_writer.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_META_WRITER_H
 #define SQFS_META_WRITER_H
diff --git a/include/sqfs/predef.h b/include/sqfs/predef.h
index df08b1b..c8d0c19 100644
--- a/include/sqfs/predef.h
+++ b/include/sqfs/predef.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * predef.h
+ * predef.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_PREDEF_H
 #define SQFS_PREDEF_H
diff --git a/include/sqfs/super.h b/include/sqfs/super.h
index a8697a1..4556d3d 100644
--- a/include/sqfs/super.h
+++ b/include/sqfs/super.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * super.h
+ * super.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_SUPER_H
 #define SQFS_SUPER_H
diff --git a/include/sqfs/table.h b/include/sqfs/table.h
index 010d5f9..0788538 100644
--- a/include/sqfs/table.h
+++ b/include/sqfs/table.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * table.h
+ * table.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_TABLE_H
 #define SQFS_TABLE_H
diff --git a/include/sqfs/xattr.h b/include/sqfs/xattr.h
index 23587d1..d1f242b 100644
--- a/include/sqfs/xattr.h
+++ b/include/sqfs/xattr.h
@@ -1,8 +1,21 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
- * xattr.h
+ * xattr.h - This file is part of libsquashfs
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 #ifndef SQFS_XATTR_H
 #define SQFS_XATTR_H
diff --git a/include/util.h b/include/util.h
index e2089da..fb927b5 100644
--- a/include/util.h
+++ b/include/util.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * util.h
  *
diff --git a/lib/sqfs/block_processor.c b/lib/sqfs/block_processor.c
index 649e97f..3fa37fd 100644
--- a/lib/sqfs/block_processor.c
+++ b/lib/sqfs/block_processor.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * block_processor.c
  *
diff --git a/lib/sqfs/block_processor_parallel.c b/lib/sqfs/block_processor_parallel.c
index b9a14c6..05c07f1 100644
--- a/lib/sqfs/block_processor_parallel.c
+++ b/lib/sqfs/block_processor_parallel.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * block_processor.c
  *
diff --git a/lib/sqfs/comp/compressor.c b/lib/sqfs/comp/compressor.c
index c938fe2..765558f 100644
--- a/lib/sqfs/comp/compressor.c
+++ b/lib/sqfs/comp/compressor.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * compressor.c
  *
diff --git a/lib/sqfs/comp/gzip.c b/lib/sqfs/comp/gzip.c
index bec217a..b18d5f7 100644
--- a/lib/sqfs/comp/gzip.c
+++ b/lib/sqfs/comp/gzip.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * gzip.c
  *
diff --git a/lib/sqfs/comp/internal.h b/lib/sqfs/comp/internal.h
index 29b875f..f57f2ce 100644
--- a/lib/sqfs/comp/internal.h
+++ b/lib/sqfs/comp/internal.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * internal.h
  *
diff --git a/lib/sqfs/comp/lz4.c b/lib/sqfs/comp/lz4.c
index e96ab45..ef4ab99 100644
--- a/lib/sqfs/comp/lz4.c
+++ b/lib/sqfs/comp/lz4.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * lz4.c
  *
diff --git a/lib/sqfs/comp/lzo.c b/lib/sqfs/comp/lzo.c
index e4a7ca6..8589dfb 100644
--- a/lib/sqfs/comp/lzo.c
+++ b/lib/sqfs/comp/lzo.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * lzo.c
  *
diff --git a/lib/sqfs/comp/xz.c b/lib/sqfs/comp/xz.c
index 24602ec..b26e6f1 100644
--- a/lib/sqfs/comp/xz.c
+++ b/lib/sqfs/comp/xz.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * xz.c
  *
diff --git a/lib/sqfs/comp/zstd.c b/lib/sqfs/comp/zstd.c
index 5434e1f..312679a 100644
--- a/lib/sqfs/comp/zstd.c
+++ b/lib/sqfs/comp/zstd.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * zstd.c
  *
diff --git a/lib/sqfs/dir_writer.c b/lib/sqfs/dir_writer.c
index aab5479..70c035e 100644
--- a/lib/sqfs/dir_writer.c
+++ b/lib/sqfs/dir_writer.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * dir_writer.c
  *
diff --git a/lib/sqfs/id_table.c b/lib/sqfs/id_table.c
index 92a0039..55477dc 100644
--- a/lib/sqfs/id_table.c
+++ b/lib/sqfs/id_table.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * id_table.c
  *
diff --git a/lib/sqfs/io.c b/lib/sqfs/io.c
index db60964..d0b2558 100644
--- a/lib/sqfs/io.c
+++ b/lib/sqfs/io.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * io.c
  *
diff --git a/lib/sqfs/meta_reader.c b/lib/sqfs/meta_reader.c
index 7d56869..72d8db1 100644
--- a/lib/sqfs/meta_reader.c
+++ b/lib/sqfs/meta_reader.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * meta_reader.c
  *
diff --git a/lib/sqfs/meta_writer.c b/lib/sqfs/meta_writer.c
index 4bd7e56..29fa183 100644
--- a/lib/sqfs/meta_writer.c
+++ b/lib/sqfs/meta_writer.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * meta_writer.c
  *
diff --git a/lib/sqfs/process_block.c b/lib/sqfs/process_block.c
index 2c1395f..f8b4d6c 100644
--- a/lib/sqfs/process_block.c
+++ b/lib/sqfs/process_block.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * process_block.c
  *
diff --git a/lib/sqfs/read_inode.c b/lib/sqfs/read_inode.c
index 56ea6a4..3efb1d8 100644
--- a/lib/sqfs/read_inode.c
+++ b/lib/sqfs/read_inode.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * read_inode.c
  *
diff --git a/lib/sqfs/read_super.c b/lib/sqfs/read_super.c
index 23909e0..b2f363a 100644
--- a/lib/sqfs/read_super.c
+++ b/lib/sqfs/read_super.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * read_super.c
  *
diff --git a/lib/sqfs/read_table.c b/lib/sqfs/read_table.c
index 129ecaf..e5461a4 100644
--- a/lib/sqfs/read_table.c
+++ b/lib/sqfs/read_table.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * read_table.c
  *
diff --git a/lib/sqfs/readdir.c b/lib/sqfs/readdir.c
index 25d0438..9db316e 100644
--- a/lib/sqfs/readdir.c
+++ b/lib/sqfs/readdir.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * readdir.c
  *
diff --git a/lib/sqfs/super.c b/lib/sqfs/super.c
index b3984d2..10d911b 100644
--- a/lib/sqfs/super.c
+++ b/lib/sqfs/super.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * super.c
  *
diff --git a/lib/sqfs/write_inode.c b/lib/sqfs/write_inode.c
index 42ec58f..6e36544 100644
--- a/lib/sqfs/write_inode.c
+++ b/lib/sqfs/write_inode.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * write_inode.c
  *
diff --git a/lib/sqfs/write_table.c b/lib/sqfs/write_table.c
index 8d20a74..3c718ea 100644
--- a/lib/sqfs/write_table.c
+++ b/lib/sqfs/write_table.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * write_table.c
  *
diff --git a/lib/sqfs/xattr.c b/lib/sqfs/xattr.c
index dd8f2ee..985fc95 100644
--- a/lib/sqfs/xattr.c
+++ b/lib/sqfs/xattr.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * write_xattr.c
  *
diff --git a/lib/sqfs/xattr_reader.c b/lib/sqfs/xattr_reader.c
index 1634be8..d0c8800 100644
--- a/lib/sqfs/xattr_reader.c
+++ b/lib/sqfs/xattr_reader.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * xattr_reader.c
  *
diff --git a/lib/util/alloc.c b/lib/util/alloc.c
index eda0e63..924f8e8 100644
--- a/lib/util/alloc.c
+++ b/lib/util/alloc.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * alloc.c
  *
diff --git a/lib/util/dirstack.c b/lib/util/dirstack.c
index 84da3fb..8f7baf1 100644
--- a/lib/util/dirstack.c
+++ b/lib/util/dirstack.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * dirstack.c
  *
diff --git a/lib/util/mkdir_p.c b/lib/util/mkdir_p.c
index 1040453..f9d7730 100644
--- a/lib/util/mkdir_p.c
+++ b/lib/util/mkdir_p.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * mkdir_p.c
  *
diff --git a/lib/util/padd_file.c b/lib/util/padd_file.c
index 21950b4..8c7120b 100644
--- a/lib/util/padd_file.c
+++ b/lib/util/padd_file.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * padd_file.c
  *
diff --git a/lib/util/read_data.c b/lib/util/read_data.c
index 47058d0..f35d579 100644
--- a/lib/util/read_data.c
+++ b/lib/util/read_data.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * read_data.c
  *
diff --git a/lib/util/read_data_at.c b/lib/util/read_data_at.c
index e055433..058909a 100644
--- a/lib/util/read_data_at.c
+++ b/lib/util/read_data_at.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * read_data_at.c
  *
diff --git a/lib/util/str_table.c b/lib/util/str_table.c
index ab07738..5f6543e 100644
--- a/lib/util/str_table.c
+++ b/lib/util/str_table.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * str_table.c
  *
diff --git a/lib/util/write_data.c b/lib/util/write_data.c
index cc4947f..8b4c00d 100644
--- a/lib/util/write_data.c
+++ b/lib/util/write_data.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
 /*
  * write_data.c
  *