I cannot use Adobe Reader to open PDFs in protected webpages

Hello,
I just downloaded the application Adobe Reader in my iPhone 5 (iOS 6.0.2). My problem started when I tried to open my school BlackBoard Learning system (Safari showes a thumbnail of a lock in the top bar meaning page has some security constrains) and then I wanted to access some PDF material. Unfortunately, I couldn't open it through the application. The bar that should appear once a page with PDF is opened did not appear!(The one that says 'Open in ') I really need a solution for this since most of the content there is in the form of PDF file.
Thank you in advance.

You could try going to an Apple store to ask them about this.
It's important to note that there are no browser plugins in Safari, so until the "open in" button is touched, only Safari is involved and the opening App does not have a chance to see the file until after the file is downloaded and handed off. If the bar isn't showing up in Safari, it could be one of two things:
1) A bug in Safari
2) The website may not be returning pdf content correctly (or at all). Some websites try to detect the presence of a browser plugin before sending a PDF. Since there are no plugins to Safari, this detection would fail on mobile browsers. In this case, the website owner should update the service to serve PDF's to mobile browsers.

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