GnuPG and RSA/IDEA extensions

Dave Dykstra dwd at
Tue Feb 16 09:27:35 CET 1999

On Feb 16,  9:19am, Werner Koch wrote:
> Rich Wales <richw at> writes:
> > PGP 5.x, or PGP 2.6.x) to use for a given message, or else (2) an RSA
> > extension for GnuPG using RSAREF (I currently live in the US), so that
> But have a look at the GPL and grep for "patent".

The GPL prohibits distribution of non-free patented software, but not
*hooks* to it.  U.S. people can obtain the patented RSAREF implementation
themselves if GnuPG came with the hooks, like SSH does.

- Dave Dykstra

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