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I have modified some files of an open source project under GNU GENERAL PUBLIC LICENSE to add some specific features.
I would add the same license for the part of the code written by me.
How i should do this?
What is the preamble that have to be added to files modified?
Thanks
Usually because of the Gnu GPL definition, if the code is under GPL license and if any changes made to the code then the total code should be licensed under the GPL compatible license. But usually everyone license the code under the same GPL license.
GPL frequently used questions
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If my app uses library A - GNU license, library B - BSD license and library C - MIT license, and I want to pack these libraries together with my app in one zip file, what is the preferred way to mention the licenses? Do I write a license.txt that is a list of the three libraries and their respective license texts?
what is the preferred way to mention the licenses? Do I write a license.txt that is a list of the three libraries and their respective license texts?
It's common you create a file called COPYING containing the packages licensing first and then you list those parts you use (this software contains components under their own license). Exemplary I find the Licenses compiled by The XFree86 Project, could give some inspiration. Additionally there is Maintaining Permissive-Licensed Files in a GPL-Licensed Project: Guidelines for Developers.
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Can I use MySQL community edition in a commercial product for free?
The product is not open source.
Do I need to acquire some kind of license or not, in order to use MySQL?
Thanks
MySQL is licensed under the GPL with the linking exception. That basically means that you can link your own program against MySQL libs without licensing it under the GPL as well.
But you have to obey all other terms of the GPL, such as providing the license info for MySQL, providing the source code of it (and more, see GPL license text).
Depending on your product this can either be acceptable or you want to buy a license to get rid of the GPL requirements.
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I would like to know if I can use MySQL Connector (libmysql.dll) with comercial Lazarus project. As far as I know, it's under GNU GPL.
Thanks for any answers.
Not if you want to sell your end product, unless you want to licence it under GPL as well.
MySQL Connector also provides commercial licenses for that purpose.
The answer is right on the page you're linking to:
MySQL open source software is provided under the GPL License.
Check out http://www.mysql.com/about/legal/licensing/oem/ which should tell you which is the license you need.
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Can someone tell me which all licenses restrict a user from removing the license notification at the top of a file?
Case:
Some JavaScript files have sections like this:
“/* RequireJS 0.26.0 Copyright (c) 2010-2011, The Dojo Foundation All
Rights Reserved. Available via the MIT or new BSD license. see:
http://github.com/jrburke/requirejs for details
*/”
During compression is it fair to remove this?
You won't run into any problems removing the license from the top if it doesn't say you can't. A minifier will remove the comment too.
Just don't redistribute the code without the license.
Both the MIT and BSD licenses (the two options that header indicates) require that the license is kept intact. You should not remove it during compression.
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Let's say write a C library, and I want all versions of the source to carry my copyright/license, but I want users of the library distributing executable code, static or dynamically linked library to be a able to do so without restriction (including making reference to my particular license). Does such an open source license exist?
Both the zlib/libpng license and the Boost license fit those criteria.
There is always the DWTFYW License :)