[tahoe-dev] Is TGPPL compatible with Apache license?

[Daira Hopwood (formerly David-Sarah)]

On 13/05/13 16:19, Zhou, Yuan wrote:
> Hi lists,
> 
> I've got some updates here, after a sync up with our legal, here is the new question:
> 
> 1. If we combine TGPPL code with Apache code to create one work derived from both TGPPL
> code and Apache code, can we redistribute such work under Apache license only and
> permanently?

No. The TGPPL obligates you to release the part of the work that was derived from the
TGPPL code under GPL after one year (if you distribute it at all), and that would cause
a conflict with the Apache license. That is, in the absence of any license exceptions
you would not be able to redistribute the work at all after one year, under any license,
as far as I understand.

Note that Tahoe-LAFS has the Apache license exception (in both its GPL and TGPPL
licensing options), so you *can* create a work derived from both Tahoe-LAFS and an
Apache-licensed work, and redistribute it after one year. However, you cannot do so
under a pure Apache license; you must keep the Tahoe-LAFS-derived parts licensed under
the GPL.

> 2. If we include TGPPL code (unmodified or modified), as a standalone dynamic library, 
> in our Apache project, can we redistribute the TGPPL code under Apache license only and
> permanently?

No, this is no different from the cases above.

-- 
Daira Hopwood ⚥  (formerly David-Sarah)

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