Locking Down Devices

I work at a library that circulates roughly 40 Sony PRS-T1 and PRS-T2 devices to our public. Although we turned off all of the "remember my password" type settings for the browsers and made sure the Reader Store was prompting for a login, patrons have still been purchasing and downloading content from the reader store. Some people are upset that they've lost money and a few of the titles downloaded have been highly inappropriate and are stuck on the device's Reader Store account even after I delete the item from the device itself. I have noticed that most of the titles being downloaded are free, but I still haven't been able to replicate how the patrons are getting past the sign in page.
Does anyone know of a way to lock the devices down so that patrons can't download/purchase content from the Reader Store? We only want them using the "Public Library" application to check out books on these devices. Thanks!

Thanks for your response. Where on a PRS-T2 when logged into the Reader Store is the "Sign Out" button? I've not located one so far. Also, I had a device I was working with that had not been signed in at all to the reader store (got the prompt to sign in). I went tot he public library app, browsed a bit but never signed in there either. Then when I went back to the Reader Store, the device was suddenly signed in. Any idea how this can happen? The devices are set to not remember passwords, I've cleared all of the form data, cache, passwords, and history and yet it still managed to sign itself in.
Thanks.

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