Hi @Xiaoguang @aMahvan,
There is no way to remove attribution if you’re using Cesium ion or other third-party data with attribution requirements, regardless of your license. As described in the link above, the Cesium ion logo and data attribution is required on the main screen. If your application targets mobile devices, attribution can be moved to a splash screen accessible from the main window.
If you are not using Cesium ion services or datasets, or other data with attribution requirements (your project contains only your own datasets or datasets which you have the right to use without attribution) you may remove the attribution.
If you are interested in tiling your own data for local use and don’t require Cesium ion services, you can reach out to our sales team to set up a custom plan.
You can read more in this thread.
-Alex