That depends on the license type. Personal licenses often allow 1–3 concurrent devices. Enterprise licenses allow many more. Check the End User License Agreement (EULA) that came with your key.
: The player includes a built-in KDM (Key Delivery Message) database to decrypt and play protected commercial content. NeoDCP Player - The Most Progressive DCP Player Software
If you are a content distributor or developer testing Neodcp integration, you may request a limited-time development license key from the vendor. These are typically valid for 30–90 days and are restricted to non-commercial use.