According to the README[1] on their source repository, that is, flatly, untrue.
They say:
> We are very happy that oCIS does not require a Contributor License Agreement (CLA) as it is Apache 2.0 licensed. We hope this will make it easier to contribute code. If you want to get in touch, most of the developers hang out in our rocket chat channel or reach out to the ownCloud central forum.
They also say:
> Some builds of stable ownCloud Infinite Scale releases provided by ownCloud GmbH are subject to an End User License Agreement.
They say:
> We are very happy that oCIS does not require a Contributor License Agreement (CLA) as it is Apache 2.0 licensed. We hope this will make it easier to contribute code. If you want to get in touch, most of the developers hang out in our rocket chat channel or reach out to the ownCloud central forum.
They also say:
> Some builds of stable ownCloud Infinite Scale releases provided by ownCloud GmbH are subject to an End User License Agreement.
Which seems both reasonable and sensible...
[1](https://github.com/owncloud/ocis/tree/master)