private static var trialErrorMessage:String = "The trial period has been passed.";
private static var undefinedMessage:String = "Unknow Error!";
 
import com.richmediaplus.utils.DateUtils;
 
import flash.net.SharedObject;
import flash.net.SharedObjectFlushStatus;
 
/**
 * 驗證是否已過試用期期。
 * @return True: 超出試用期; False: 試用期內
 * @author Alvin/AedisJu
 * @blog http://blog.richmediaplus.com
 */
private function checkExpDate(className:String):Boolean {
	trialErrorMessage = className + ":: " + trialErrorMessage;
	var so:SharedObject = SharedObject.getLocal(className, "/");
	var strExpDate:Date = so.data.validateData;
 
	//調試的時候記住清空啊！
	//so.clear()
 
	//如果第一次使用，計算試用期過期時間。
	if (strExpDate == null) {
		var trailBeginDate:Date = new Date();
		//效率，讓你10秒就過期啦！
		trailBeginDate = DateUtils.dateAdd(DateUtils.SECONDS, 10, trailBeginDate);
		so.data.validateData = trailBeginDate;
 
		var flushStatus:String = null;
		try {
			flushStatus = so.flush();
		}
		catch (error:Error) {
			throw new Error(undefinedMessage);
			return true;
		}
		if (flushStatus != null) {
			switch (flushStatus) {
				case SharedObjectFlushStatus.PENDING:
					throw new Error(undefinedMessage);
					return true;
					//trace("Requesting permission to save object...")
					break;
				case SharedObjectFlushStatus.FLUSHED:
					//trace("Value flushed to disk.")
					break;
			}
		}
		return false;
	}
 
	//試用期過期時間與今天比較，如果今天已經超過試用期，則返回true。
	var strNowDate:Date = new Date();
	if (strExpDate < strNowDate) {
		return true;
	}
 
	return false;
}

package com.richmediaplus.trail
{
	import flash.utils.getQualifiedClassName;
	import mx.containers.Panel;
 
	/**
	 * TrailPanel
	 * @author Alvin/AedisJu
	 * @blog http://blog.richmediaplus.com
	 */
	public class TrailPanel extends Panel
	{
		include "trail.as"
 
		public function TrailPanel()
		{
			super();
			if(checkExpDate("com.richmediaplus.trail.TrailPanel")) {
				throw new Error(trialErrorMessage);
			}
			this.title = "Free trail product!"
		}
	}
}

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:trail="com.richmediaplus.trail.*">
	<trail:TrailPanel width="400" height="300"/>
</mx:Application>