diff --git a/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/SecureEventInputSputnik.swift b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/SecureEventInputSputnik.swift
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+++ b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/SecureEventInputSputnik.swift
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+// (c) 2023 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// No trademark license is granted to use the trade names, trademarks, service
+// marks, or product names of Contributor, except as required to fulfill notice
+// requirements defined in MIT License.
+
+/// A Swift script to check whether a non-system process is abusing the SecureEventInput.
+
+import AppKit
+import IOKit
+
+public enum SecureEventInputSputnik {
+  public static func getIORegListResults() -> String? {
+    var resultDictionaryCF: Unmanaged<CFMutableDictionary>?
+    /// Regarding the parameter in IORegistryGetRootEntry:
+    /// Both kIOMasterPortDefault and kIOMainPortDefault are 0.
+    /// The latter one is similar to what `git` had done: changing "Master" to "Main".
+    let statusSucceeded = IORegistryEntryCreateCFProperties(
+      IORegistryGetRootEntry(0), &resultDictionaryCF, kCFAllocatorDefault, IOOptionBits(0)
+    )
+    guard statusSucceeded == KERN_SUCCESS else { return nil }
+    let dict = resultDictionaryCF?.takeRetainedValue()
+    guard let dict: [CFString: Any] = dict as? [CFString: Any] else { return nil }
+    return (dict.description)
+  }
+
+  /// Find all non-system processes using the SecureEventInput.
+  /// - Parameter abusersOnly: List only non-frontmost processes.
+  /// - **Reason to Use**: Non-frontmost processes of such are considered abusers of SecureEventInput,
+  /// hindering 3rd-party input methods from being switched to by the user.
+  /// They are also hindering users from accessing the menu of all 3rd-party input methods.
+  /// There are Apple's internal business reasons why macOS always has lack of certain crucial input methods,
+  /// plus that some some IMEs in macOS have certain bugs / defects for decades and are unlikely to be solved,
+  /// making the sense that why there are needs of 3rd-party input methods.
+  /// - **How to Use**: For example, one can use an NSTimer to run this function
+  /// with `abusersOnly: true` every 15~60 seconds. Once the result dictionary is not empty,
+  /// you may either warn the users to restart the matched process or directly terminate it.
+  /// Note that you cannot terminate a process if your app is Sandboxed.
+  /// - Returns: Matched results as a dictionary in `[Int32: NSRunningApplication]` format. The keys are PIDs.
+  /// - Remark: The`"com.apple.SecurityAgent"` won't be included in the result since it is a system process.
+  public static func getRunningSecureInputApps(abusersOnly: Bool = false) -> [Int32: NSRunningApplication] {
+    var result = [Int32: NSRunningApplication]()
+    guard let rawData = getIORegListResults() else { return result }
+    rawData.enumerateLines { currentLine, _ in
+      guard currentLine.contains("kCGSSessionSecureInputPID") else { return }
+      guard let filteredNumStr = Int32(currentLine.filter("0123456789".contains)) else { return }
+      guard let matchedApp = NSRunningApplication(processIdentifier: filteredNumStr) else { return }
+      guard matchedApp.bundleIdentifier != "com.apple.SecurityAgent" else { return }
+      if abusersOnly {
+        guard !matchedApp.isActive else { return }
+      }
+      result[filteredNumStr] = matchedApp
+    }
+    return result
+  }
+}