I want to know if is it Ok to modify a free extension to support the newer version of opencart and upload it to extension directory for free or price?
If yes, can you please tell me what should I care about while doing this? Like giving credit to the author whose extension I modified?
If you plan on releasing a commercial extension, I would strongly encourge you write all your own code. It allows you to understand and have control over all the code in your extension, and gives your customers some assurance that you're a competent developer.
Basically all extensions (except templates!) should be licensed under the GNU/GPL.Johnathan wrote:Unless the extension has a license file that specifically allows this, or you're able to contact the author of the extension directly, I would highly recommend you don't do this. If you upload an extension that has code from another extension, and the developer complains about it, you'll be banned from the OpenCart store and forums
This license allows you (and force you to) adopt the extension to your needs and if you want you can publish it.
If you find that the extension has bugs, or should be modified with new features, go ahead and publish.
Generally it is recommended to contact the author - before you start, or after you have finished your work.
I know that most of the developers are cooperative - some are very strange.
If he agree, you can use the same name and publish.
If not, use a new name - BUT state that this 'new' extension is a 'derivat' of someone alse work. If you do that not, you will get in troubles.
In every case you have to follow the original license, if it is GPL > GPL, if AGPL > AGPL, etc.
Or 'downgrade' the license - but never change from a GPL to a commercial.
What you never can do, is to rework an existing extension - maybe with the same code - and sell it.
Result will result in a ban of the OC-Store (or whereever you publish it) and possible the laywer.
Another point is if the license is a 'commercial'.
Then you can modify whatever you want, but NEVER PUBLISH, otherwise the laywer could knock on your door ..
A third point is taking or using another idea, and build a completely new extension. New = all lines are written by you and nothing is copied!
In such a case, you can do what you want.
Except .. publishing it in the OC-store.
They like it not very much if another extension will do the same ...
Can I still upload the extension to OC's extension directory? Wouldn't similar application would be filtered by OC team?
My 2 Cent only
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THE problem / issue is, that too many developers are using existing code (lines) and do not publish from whom these are (the origonal author).
Still OpenCart had this 'problem' a very long time.
Can someone create the same functionality's extension for the version which the other version doesn't support and upload to the OC's Extension Directory? Ofcourse, the code would be written from the ground by new author.
What is OpenCart's policy in this case?
(Personally, I think it's pretty unprofessional to copy someone else's extension and take part of their sales, but there are lots of people out there who don't seem to have the same ethical view. It seems like everyone would benefit a lot more if people would come up with unique extensions, since there would then be more variety.)
Not that that applies in your case, since the author of the original isn't selling it.
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