In the case of an Open Access publication, you can choose various Open Content licenses and different versions of publishing agreements.
For the assumption of publication costs, please choose the CC-BY license provided by Creative Commons for articles and CC-BY or CC-BY-SA for other works without further restrictive additions.
In this case, the transfer of rights to the publisher is done as a "non-exclusive" or "simple" transfer. In this way, you remain in possession of your rights of use and are not bound by the legal requirements of the publisher.
Such an adjustment is often possible subsequently, after the publication contract has been concluded, if you indicate that your publication will not otherwise be funded. After publication, changes are usually no longer possible.