Why [LWN.net]

Why

Posted Jun 26, 2023 4:58 UTC (Mon) by joib (subscriber, #8541)
In reply to: Why by pizza
Parent article: Kuhn: A Comprehensive Analysis of the GPL Issues With the Red Hat Enterprise Linux (RHEL) Business Model

CUPS is licensed under Apache 2.0 with the "LLVM exception" https://spdx.org/licenses/LLVM-exception.html which should make it compatible with the GPL 2.0.

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Why

Posted Jun 26, 2023 13:40 UTC (Mon) by pizza (subscriber, #46) [Link] (3 responses)

> CUPS is licensed under Apache 2.0 with the "LLVM exception" https://spdx.org/licenses/LLVM-exception.html which should make it compatible with the GPL 2.0.

Do you have a citation for that?

Because this isn't documented in the LICENSE file of either CUPS repository [1], nor is it mentioned in the handful of source files I just looked at, which all seem (only) say: 'Licensed under Apache License v2.0 See the file "LICENSE" for mode information.

[1] Apple CUPS or OpenPrinting CUPS

Why

Posted Jun 26, 2023 13:47 UTC (Mon) by joib (subscriber, #8541) [Link] (2 responses)

Quoting from https://github.com/OpenPrinting/cups/blob/master/NOTICE :

>
> -- CUPS Exceptions to the Apache 2.0 License --
>
> As an exception, if, as a result of your compiling your source code, portions
> of this Software are embedded into an Object form of such source code, you
> may redistribute such embedded portions in such Object form without complying
> with the conditions of Sections 4(a), 4(b) and 4(d) of the License.

> In addition, if you combine or link compiled forms of this Software with
> software that is licensed under the GPLv2 ("Combined Software") and if a
> court of competent jurisdiction determines that the patent provision (Section
> 3), the indemnity provision (Section 9) or other Section of the License
> conflicts with the conditions of the GPLv2, you may retroactively and
> prospectively choose to deem waived or otherwise exclude such Section(s) of
> the License, but only in their entirety and only with respect to the Combined
> Software.

Why

Posted Jun 26, 2023 13:59 UTC (Mon) by pizza (subscriber, #46) [Link] (1 responses)

> Quoting from https://github.com/OpenPrinting/cups/blob/master/NOTICE :

Thank you.

But it's not clear which files, if any, this NOTICE applies to -- Because all of the source files still only mention ASLv2 and the LICENSE, with no mention of the exception.

(Also, looking at the git history, the exception was added in 2019, nearly two years after the ASL2 relicensing...)

Why

Posted Jun 26, 2023 14:07 UTC (Mon) by joib (subscriber, #8541) [Link]

That's something you'll have to ask OpenPrinting; I'm not affiliated with that project in any way.

Might actually be a good reason for a bug report, I agree with you the situation is unclear.