[cfe-dev] ARM contributing to libc++ & libc++abi

[Sebastian Redl]

On 02.12.2014 15:43, Marshall Clow wrote:
>
>> On Dec 1, 2014, at 5:30 AM, Arnaud A. de Grandmaison 
>> <arnaud.degrandmaison at arm.com <mailto:arnaud.degrandmaison at arm.com>> 
>> wrote:
>>
>> We (ARM) intend to contribute to libc++ and libc++abi.
>> However, in order to do that, we would first need to add a 
>> ‘NOTICE.TXT’ file at the root of each of these projects which would 
>> contain:
>> ===================
>> Patent agreement notice to LLVM users in accordance with Paragraph 2 
>> of LLVM
>> Developer Policy, Patents subsection:
>> Presently, ARM is unaware of any patents that would read on its LLVM
>> contributions. Nonetheless, to avoid doubt with respect to patent rights,
>> ARM hereby grants recipients of the software distributed by LLVM a 
>> perpetual,
>> worldwide, non-exclusive, no-charge, royalty-free, irrevocable patent 
>> license
>> to make, have made, use, offer to sell, sell, import, and otherwise 
>> transfer
>> software distributed by LLVM, where such license applies only to 
>> those patent
>> claims licensable by ARM that are necessarily infringed by ARM's 
>> contributions.
"necessarily infringed"? Does that mean that if ARM contributes code 
that unnecessarily uses ARM-owned patents, people don't get the implicit 
license and are liable?
>> This does not change any licensing terms; it essentially helps limit 
>> any patent claims on ARM
Isn't the point to limit patent claims *by* ARM on users of LLVM? I 
don't see how this license would limit claims *on* ARM, nor why the 
project would care about that. Unless the lawyers have managed to 
corrupt the meaning of "on" in this case.

Sebastian
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