In the FAQ there is
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Can I write closed source or proprietary apps for ownCloud Server?
Yes, but following the requirements of the under the AGPLv3, these can be distributed or made available to users outside of your household or organization only under the ownCloud Enterprise Edition, which supports integration with proprietary technologies. Contact ownCloud, Inc. for details.
As i understand it the code has to be released under AGPLv3 too _or_ this apps need to be done under owncloud enterprise license.
I like the idea of having also commercial apps but is it legal?