In the page level security, I do not see the option
'Page Access Protection' - to select Arguments must have checksum.
Thanks for your use of the Database Cloud Service. I have checked in my Database Cloud Trial, and I do have that option in the Security tab for the page. I'm not sure why you might be experiencing a problem, but it is not there in my trial service.
- Rick Greenwald
Thanks fpr the reply. I have logged a SR on this..