Clarification OpenSource versus Premium - long term strategy of ZK

asked 2011-01-31 02:39:00 +0800

BerndWill gravatar image BerndWill
150 1


I just entered the download page and found the different packages (OpenSource, Premium etc.).

It is not clear for me:
a) where is the difference ?
b) do I have to pay something for premium packages ?
c) what is the long term strategy of ZK ?

There are many sourceforge projects, which offer a free OpenSource version of their products for ussage in other OpenSource and personal projects, while business applications should pay for the download of premium packages (paying fees for the current versions with more features).

It would be very helpful, if you would explain and visualize more clearly what strategy you are after.

I learned ZK as an openSource framework, but I am not sure whether you are planning to turn it into a paid framework someday or if you will always keep up a OpenSource version with limited features (or an elder version) and a business package with more elaborate features for the professional users. It is very important that the ZK developers understand whether they can rely on the OpenSource commitment.

Could you please write an article or explain it more clearly ?

Thanks in advance

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answered 2011-01-31 03:53:52 +0800

mjablonski gravatar image mjablonski
1284 3 5

updated 2011-01-31 03:54:19 +0800

Hi Bernd,

you can find the differences between the packages here:


The ZK-CommunityEdition is released under LGPL which is a commercial friendly OS-license. For professional and enterprise releases you can ask for an dedicated open-source license or pay the license fee for closed-source/commercial projects.

For me (I'm not involved with Potix company) this is a very fair strategy and I trust Potix in releasing a high-quality community release in the future.

Cheers, Maik

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answered 2011-01-31 05:26:34 +0800

tmillsclare gravatar image tmillsclare
799 2 5 29

Hey Bernd,

Just wanted to reply and echo what Maik said.

Our ZK CE version is licensed under the LGPL which, as Maik stated, is free to be used in your open source or commercial application. In addition to this if your project is open source and requires ZK PE or EE then you are free to use it in your application under the ZK Open Source License (ZOL) free of charge.

Regarding ZK CE and future concerns, we strongly believe that a healthy company requires a high quality open source version. This is why we are fully commited to the further development of CE & the moving of features from PE and EE to CE.

So rest assured with the availability and commitment to ZK CE under the LGPL and the availability of both PE & EE under our ZK Open Source License our open source offerings are very strong.


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answered 2011-01-31 06:38:50 +0800

mjablonski gravatar image mjablonski
1284 3 5


did you have a look at the comparision table for ZK editions?


Cheers, Maik

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answered 2011-01-31 06:39:59 +0800

BerndWill gravatar image BerndWill
150 1

Thanks, Maik

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Asked: 2011-01-31 02:39:00 +0800

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Last updated: Jan 31 '11

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