[Qt-interest] How to encrypt/decrypt my sqlite database whichcreated by Qt SQL module?

[Andre Somers]

Op 26-1-2011 11:45, Wei Song schreef:
> Hi Nokia guy or Qt guy,
This is not an official support channel. Users are the most predominant 
members on this list, though sometimes Trolls do respond with 
(unofficial) answers.
> If I modify the Qt Sqlite3 plugin source code for implement the
> SQLite3 encrypt/decrypt database function and build the modified
> source code to dll file, can I use that dll in commercia project?
>
> If need open source, I should open the Qt Sqlite3 plugin source code
> or all my commercia project?
Like I said before:
You do *not* need to open op all of your application.
You *do* need to open source the changed SQL plug-in, as it is based on 
Qt's LGPL licensed code.

That is: you *only* need to release your modifications to Qt code: the 
SQLite plug-in source code that you added encryption support to. That 
plug-in you release, will itself be licensed under the LGPL again, and 
thus you can use it in your own (closed) project. Just make sure you use 
dynamic linking (dll files), and don't compile everything into the 
executable.

André
who still is not a lawyer.


> /**********************************
> Learn more, do not know more
> Wei Song
> **********************************/
>
>
>
> 2011/1/20 Andre Somers<andre at familiesomers.nl>:
>> Op 20-1-2011 4:36, Wei Song schreef:
>>> Thanks.
>>> It means that I should modify and compile Qt source code?
>>> Can I use that way in commercia project and NOT NEED to open source?
>> *If* you need to make modifications in the Qt source code, what is the
>> problem with releasing those changes? It doesn't mean you need to open
>> up all your code, just your modifications to the libraries. That doesn't
>> like like a big hurdle to me, nor does it sound unfair to be required to
>> do so.
>>
>> André
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