When is it mandatory to create a taskflow under WEB-INF folder?

Hi,
Today, I accidentally created a taskflow with a folder structure which is not under WEB-INF. To my surprise it is working. :)
1) Is it safe practice to create a taskflow not under WEB-INF folder?
2) When is it mandatory to create a taskflow under WEB-INF folder?
Thanks,
Srini

Placing the taskflow in a) inside WEB-INF or b) outside WEB-INF folder will work as expected.
But when a taskflow is placed inside the WEB-INF folder, it is secure.
The blog post by Andrejus Baranovskis (http://andrejusb.blogspot.com/2011/02/beware-of-hackers-keep-adf-task-flows.html) suggested by Vinod has the detailed information regarding this.
Thanks,
Navaneeth

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