privacy concerns in using google doc viewer -

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I am planning to use to preview documents before printing.

In my application the servicelet code is running GAE which sends the file before sending the user / session validationandendend method. But when I point out my YouTube to the Google Dock Viewer, the user's check might fail.

I can not delete this check if anyone can open my URL to download the file. How can I worry about this security? Is there a way to give Google Doc viewer user information? If there are no alternatives?


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