Re: OCB blockcipher mode - is it allowed?

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On Sun, Aug 28, 2016 at 2:56 AM, Christopher <ctubbsii@xxxxxxxxxxxxxxxxx> wrote:
> On Sat, Aug 27, 2016 at 6:16 PM Igor Gnatenko <ignatenko@xxxxxxxxxx> wrote:
>>
>> Hi,
>>
>> I have some questions about OCB[0] and it's usage in Fedora.
>>
>> I wanted to package pycryptodome[1] and found that they implement OCB
>> in their code. From my POV (completely without any legal knowledge) it
>> seems that it's not completely free[2] as it's not allowed for
>> military use. It seems to be allowed without any restrictions only for
>> OpenSSL.
>>
>> What do you think? Looks like now we have mosh[3] packaged and it
>> includes OCB (so if it's not acceptable, it most probably should be
>> removed).
>>
>>
>> [0] http://web.cs.ucdavis.edu/~rogaway/ocb/
>> [1] https://pycryptodome.readthedocs.io/en/latest/
>> [2] http://web.cs.ucdavis.edu/~rogaway/ocb/license.htm
>> [3] https://mosh.org
>> --
>> -Igor Gnatenko
>>
>
> I'm not a lawyer, but it seems to me that OCB is available to be implemented
> under 4 different license options:
> 1. Any open source software licensed under an approved license by OSI or
> public domain.
> 2. General license for non-military use.
> 3. OpenSSL-specific use.
> 4. Special license from the patent owner.
>
> Only option 2 has the non-military restriction, and anything in Fedora would
> almost certainly fall under 1 or 3. So, I can't imagine there'd be a problem
> using the OCB patent in Fedora software. I'm actually not even sure why
> option 3 even exists, since it seems to be a subset of option 1. Regardless,
> it doesn't look like the non-military restriction of option 2 would apply if
> option 1 is used.
Unfortunately I don't know how licenses applies, so if program is
licensed under OSI-approved license then 2nd license doesn't apply
anymore?
>
> --
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> https://lists.fedoraproject.org/admin/lists/devel@xxxxxxxxxxxxxxxxxxxxxxx
>



-- 
-Igor Gnatenko
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