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Commit 8ea8814f authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jonathan Corbet
Browse files

LICENSES: Clearly mark dual license only licenses 



Just like the CDDL the Apache license and the MPL must only be used as
a choice in additional to an GPL2 compatible license.  Copy over the
boilerplate from the CDDL file to the other two after fixing it up to
make it clear the licenses need to be GPL2 compatible, not just the
more generic GPL compatible.  For example the Apache 2 license is GPL3
compatible, but that doesn't matter for the kernel.

Also move these licenses to a separate directory and document the rules
in license-rules.rst.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 6132c37c

Documentation/process/license-rules.rst

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@@ -281,7 +281,56 @@ kernel, can be broken down into: 


|



3. _`Exceptions`:

3. Dual Licensing Only



   These licenses should only be used to dual license code with another

   license in addition to a preferred license.  These licenses are available

   from the directory::



      LICENSES/dual/



   in the kernel source tree.



   The files in this directory contain the full license text and

   `Metatags`_.  The file names are identical to the SPDX license

   identifier which shall be used for the license in source files.



   Examples::



      LICENSES/dual/MPL-1.1



   Contains the Mozilla Public License version 1.1 license text and the

   required metatags::



      LICENSES/dual/Apache-2.0



   Contains the Apache License version 2.0 license text and the required

   metatags.



   Metatags:



   The metatag requirements for 'other' licenses are identical to the

   requirements of the `Preferred licenses`_.



   File format example::



      Valid-License-Identifier: MPL-1.1

      SPDX-URL: https://spdx.org/licenses/MPL-1.1.html

      Usage-Guide:

        Do NOT use. The MPL-1.1 is not GPL2 compatible. It may only be used for

        dual-licensed files where the other license is GPL2 compatible.

        If you end up using this it MUST be used together with a GPL2 compatible

        license using "OR".

        To use the Mozilla Public License version 1.1 put the following SPDX

        tag/value pair into a comment according to the placement guidelines in

        the licensing rules documentation:

      SPDX-License-Identifier: MPL-1.1

      License-Text:

        Full license text



|



4. _`Exceptions`:



   Some licenses can be amended with exceptions which grant certain rights

   which the original license does not.  These exceptions are available

LICENSES/other/Apache-2.0→LICENSES/dual/Apache-2.0

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Valid-License-Identifier: Apache-2.0

SPDX-URL: https://spdx.org/licenses/Apache-2.0.html

Usage-Guide:

  Do NOT use. The Apache-2.0 is not GPL2 compatible. It may only be used

  for dual-licensed files where the other license is GPL2 compatible.

  If you end up using this it MUST be used together with a GPL2 compatible

  license using "OR".

  To use the Apache License version 2.0 put the following SPDX tag/value

  pair into a comment according to the placement guidelines in the

  licensing rules documentation:

LICENSES/other/CDDL-1.0→LICENSES/dual/CDDL-1.0

+2 −2
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Valid-License-Identifier: CDDL-1.0

SPDX-URL: https://spdx.org/licenses/CDDL-1.0.html

Usage-Guide:

  Do NOT use. The CDDL-1.0 is not GPL compatible. It may only be used for

  dual-licensed files where the other license is GPL compatible.

  Do NOT use. The CDDL-1.0 is not GPL2 compatible. It may only be used for

  dual-licensed files where the other license is GPL2 compatible.

  If you end up using this it MUST be used together with a GPL2 compatible

  license using "OR".

  To use the Common Development and Distribution License 1.0 put the

LICENSES/other/MPL-1.1→LICENSES/dual/MPL-1.1

+4 −0
Original line number Diff line number Diff line 
Valid-License-Identifier: MPL-1.1

SPDX-URL: https://spdx.org/licenses/MPL-1.1.html

Usage-Guide:

  Do NOT use. The MPL-1.1 is not GPL2 compatible. It may only be used for

  dual-licensed files where the other license is GPL2 compatible.

  If you end up using this it MUST be used together with a GPL2 compatible

  license using "OR".

  To use the Mozilla Public License version 1.1 put the following SPDX

  tag/value pair into a comment according to the placement guidelines in

  the licensing rules documentation: