licensing

[Olly Betts]

On Sun, Feb 02, 2020 at 10:19:33PM +0100, Eric Lindblad wrote:
>    https://www.php.net/license/index.php
>     
>    The above webpage indicates a change in licensing from PHP 4 onwards.
>     
>    A possible approach might be to send an enquiry to the developers as to
>    whether the logo exclusively would be covered under the PHP License v3.01,
>    with the obligation towards prior written permission on such use, and that
>    the PHP code, name, etc., revert to the pre-PHP 4 licensing.

The relicensing of Xapian is very much not just about PHP - that's
simply an example of a current licensing incompatibility that
relicensing Xapian would address.

It would certainly be more helpful generally if PHP were licensed
compatibly with the GPL, but this isn't something I have time or
energy spare to attempt myself.  If you (or somebody else) wants to talk
to the PHP developers please do.

[...]
>    The above cited webpage also refers to a dual-license under the GNU
>    General Public License (GPL), the meaning of which might be elaborated
>    upon.

It does, but only where it explicitly says PHP 4 is NOT dual-licensed:

| Q. Why is PHP 4 not dual-licensed under the GNU General Public License
| (GPL) [...]

Cheers,
    Olly