Below is an example demonstrating how you can mark the selected assets in the Content Library pane as 'new' (untouched), via script.
// Define an anonymous function; // serves as our main loop, // limits the scope of variables (function(){ // Get the pane manager var oPaneMgr = MainWindow.getPaneMgr(); // Find the content library pane var oPane = oPaneMgr.findPane( "DzContentLibraryPane" ); // If the pane was not found if( !oPane ){ // We are done... return; } // Declare working variables var oAsset, oMeta, oInstance; // Get the selected assets var aAssets = oPane.getSelectedAssets(); // Iterate over the selected assets for( var i = 0, nAssets = aAssets.length; i < nAssets; i += 1 ){ // Get the 'current' asset oAsset = aAssets[ i ]; // If the app version is 4.9.0.11 or newer if( App.version64 >= 0x000400090000000b ){ // Set the group identifier to the "New" group oAsset.groupId = -1; //0 = None, -1 = New // Otherwise } else { // Attempt to fall back try { // Get the metadata for the asset oMeta = oAsset.getMetadata(); // Mark the item as 'new' oMeta.newItem = true; // Propagate the change oMeta.update(); // Handle errors } catch( e ){ // Define the strings used to provide feedback var sTitle = qsTr("Resource Error"); var sMessage = qsTr("A newer version of %1 is required " + "to execute this script.").arg( App.appName ); var sAccept = qsTr("&OK"); // Provide feedback to the user MessageBox.critical( sMessage, sTitle, sAccept ); // We are done... break; } } } // Get the selected container var oContainer = oPane.getSelectedContainer(); // Force a redraw of the assets oPane.updateContainer( oContainer.getIDPath() ); // Finalize the function and invoke })();