conv2 performance

[John W. Eaton]

On  3-Mar-2010, Lukas Reichlin wrote:

| > I would happily use a
| > free software library with a GPL-compatible license to implement this
| > function, but I don't know whether one is available.
| 
| I don't know whether DE01OD or DE01PD do exactly what you want, but since 
SLICOT (www.slicot.org) is GPL 2, these two convolution routines might be of 
interest.

Is it really distributed under the terms of GPLv2 only, or does the
copyright statement include the "or any later version" clause?  The
copy of the GPL that I found on www.slicot.org is GPLv3.

It seems rather free-software-unfriendly to require registration to
download anything from the www.slicot.org site...

jwe