保护的PDF文件变得更加方便,这要归功于免费的PDF保护。这是一个工具,它允许用户批量保护许多这样的文件非常简单的步骤,从而节省了大量的时间。这是非常重要的,以保护特定的文件从落入他人之手,因为它可能会损坏整个文档,并使其无效。为了避免相同,密码保护它是一个理想的选择。此工具已被设计成保护单个文件和完整的文件夹和子文件夹。因此,它非常灵活。它允许所有者创建密码从编辑,打印,复印等限制他人,而另一个用于查看该文件。免费的PDF...
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