How can I revoke the synchronisation rights for commercial user generated content from GEMA? Is there a deadline?

If GEMA intends to licence synchronisation rights for commercial uses to a UGC platform, we are going to inform you on our website accordingly. From the point in time of the publication, you have four weeks to revoke your synchronisation rights for commercial content on the respective platform so that you can manage them yourself.

You can, of course, declare that you wish to submit a blanket revocation of all services/platforms that fall under the definition. 
As a publisher, you can also submit a declaration of revocation of rights on behalf of the creators you represent. If you have been authorised by several creators to submit a declaration to revoke the rights, you can either submit a joint revocation of the rights for the works of all creators you represent or limit the declaration of the works by individual creators. A rights revocation for individual works or uses/exploitations is, however, not possible.

The details of the rights clearance process for synchronisation rights for UGC platforms are governed by the rights management conditions which you can access at managing the synchronisation rights.