Unity utility to make components not editable in Editor.

LockComponentEditor.cs

using UnityEditor;
using UnityEngine;

public static class LockComponentEditor
{
	[MenuItem("CONTEXT/Component/Lock Component")]
	public static void LockComponent(MenuCommand command)
	{
		Component component = (Component)command.context;
		component.hideFlags |= HideFlags.NotEditable;

		EditorUtility.SetDirty(component);
	}

	[MenuItem("CONTEXT/Component/Lock Component", true)]
	public static bool LockComponentValidate(MenuCommand command)
	{
		return command.context is Component component &&
		       (component.hideFlags & HideFlags.NotEditable) == 0;
	}

	[MenuItem("CONTEXT/Component/Unlock Component")]
	public static void UnlockComponent(MenuCommand command)
	{
		Component component = (Component)command.context;
		component.hideFlags &= (~HideFlags.NotEditable);

		EditorUtility.SetDirty(component);
	}

	[MenuItem("CONTEXT/Component/Unlock Component", true)]
	public static bool UnlockComponentValidate(MenuCommand command)
	{
		return command.context is Component component &&
		       (component.hideFlags & HideFlags.NotEditable) != 0;
	}
}

Make sure you place it in a Editor folder, otherwise the project will have compilation issues!