Do I own the copyright on the content I buy?
or Can a writer sell the same article to several clients?
Content created by Writers are works made for hire. According the Copyright law of the United States, and certain other copyright jurisdictions, if a work is "made for hire", the Client, not the Writer, is considered the legal author. The Writer may or may not be publicly credited for the work. You shall maintain worldwide, perpetual, irrevocable, and transferable license for any content that you approve on the platform. For such content, Writer grants and licenses to the Client the sole and exclusive right to publish, perform, display, reproduce, distribute, create derivative works and sell the delivered and approved content in any type of media, including, but not limited to, print and/or online media and all electronic, online, or any other media throughout the world.
Simplified, any content that is approved and paid for through the WriterAccess platform is the clients.