PDF文档过期时间/自毁设置

不是很完美的方法，可以凑活着用：

1. 切换到Pages预览页，右击页面选页面属性
2. 切换到Action，选Run a Javascript，代码：

// PDF JavaScript to make it a "TRIAL EDITION".

// Set the date you would like it to EXPIRE ON.
var d1 = util.scand("mm/dd/yy", "5/25/18");

// Let the script do the work...
var expire_on_X_days_left = 0;
var d2 = new Date();
var diff = (d2.valueOf() - d1.valueOf()) / 1000;
var daysleft = ((diff / 60) / 60) / 24;
if( daysleft > expire_on_X_days_left || daysleft == expire_on_X_days_left )
{
app.beep(1);
//app.alert("This document cannot be viewed anymore.");
this.closeDoc();
}
// :-) Script by Brian (thedude at bri1 com).

不知道能否连接到internet时间，然后再判断