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Once you allow a user to select the data from your database there is no way to prevent them doing what they like with the data. If it is important to you that the user can only view and not edit the data you could consider using a WMS server (e.g GeoServer, MapServer) to render the data on your server and send only an image of the rendered data to the user.


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Within a layer, you can use the z-order values to determine the QGIS feature rendering order: Open the respective layer's style panel. Either in the layer properties or in the layer styling dock (both should work) Near the bottom of the layer style panel, check the Control feature rendering order checkbox. (The "Define order" window opens, probably ...



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