linux-kernel - Re: [PATCH v39 11/24] x86/sgx: Add SGX enclave driver

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Date:   Mon, 5 Oct 2020 09:40:52 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Christoph Hellwig <hch@...radead.org>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>,
        Jordan Hand <jorhand@...ux.microsoft.com>,
        Nathaniel McCallum <npmccallum@...hat.com>,
        Seth Moore <sethmo@...gle.com>,
        Darren Kenny <darren.kenny@...cle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        haitao.huang@...el.com, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, puiterwijk@...hat.com, rientjes@...gle.com,
        tglx@...utronix.de, yaozhangx@...gle.com, mikko.ylinen@...el.com
Subject: Re: [PATCH v39 11/24] x86/sgx: Add SGX enclave driver

On 10/5/20 8:02 AM, Greg KH wrote:
> On Mon, Oct 05, 2020 at 05:23:45PM +0300, Jarkko Sakkinen wrote:
>> [*] One thing I've been wondering for a long time is that, why new code
>> should have the copyright platters in the first place? I get it for
>> pre-Git era but now there is a cryptographic log of authority.
> Go talk to your corporate lawyers about this, it is one of the most
> common cargo-cult patterns around :)

For this patch, though, it seems like we should just update the dates
instead of removing them.

If I look at the last 1000 "^+.*Copyright" lines added to the kernel,
997 of them have a year.  So, weird or not, it's a pretty standard
convention.  We'd need a slightly more broad conversation before we
decide to nix these dates.

Pure speculation: Copyright protection, at least in the US, is not
forever.  I _think_ it's 75 years or something.  That protection starts
when the work is created and is independent of when it gets merged into
Linux.  So, if we did something weird like merge a driver written 10
years ago, it would only be protected for 65 more years after we merge
it.  In other words, git history _might_ be irrelevant for copyright
protection.