Le lundi, 13 janvier 2014, 17.38:12 Didier Raboud a écrit : > Le samedi, 11 janvier 2014, 14.22:28 Daniel Kahn Gillmor a écrit : > > 0) ask CUPS to move from GPL2 to GPL2+ (with or without OpenSSL > > exception) > > As asking generally can't hurt, I have filed > https://cups.org/str.php?L4337 on the upstream bugtracker to discuss > that. I'll keep the list posted.
The answer came back faster than I expected and is public [1], I'm
quoting it here for completeness' sake:
Le lundi, 13 janvier 2014, 14:24:33 Michael Sweet a écrit :
> We cannot, for a number of legal and (Apple) liability reasons,
> relicense CUPS as [L]GPL2+. It will never happen.
>
> OpenSSL support has been removed from the CUPS 2.0 source code and is
> not an option.
>
> That leaves you with using GnuTLS ([L]GPL2/3) or porting Apple's
> CDSA/Security code (Apache license), although the Apache license may
> not be GPL3 compatible according to the FSF. Given that GnuTLS is
> included with basically every Linux distribution as a standard OS
> component, it SHOULD automatically fall under the [L]GPL2/3 exception
> for system libraries (just as OpenSSL should have fallen under the
> same exception...) If not, then I humbly suggest you talk to the FSF.
Now, for the set of options he described:
1) OpenSSL
As he claims that OpenSSL has been removed from the master CUPS
branch, I think that this, by itself, disqualifies the linking of
libcups2 against OpenSSL, as it would be a dead end.
2) GnuTLS
2.x is useable but deprecated, 3.x is GPLv3+ through GMP. We're back
to "talk to the FSF to license GMP back to LGPLv2+"
3) Apple CDSA / libsecurity
From [1], this is currently being deprecated by Apple from OSX v10.7.
Also, it licensed under the APSL [Apple Public Source License] which
is incompatible with the GPL. It isn't packaged in Debian as far as I
could find.
So in the current situation, I don't see any good long-term solution but
a port to another license-compatible library such as polarssl…
Cheers,
OdyX
[1] And GPG-signed:
http://www.cups.org/pipermail/cups-devel/2014-January/014768.html
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