Screen saver unlock/lock times....

I'm looking for a way to track when folks unlock/lock their screen savers. Is there a program or log file that can assist me here? I need to be able to do this so I can track when users are unlocking/locking their machines. Most users don't logout of their machine, so the screen saver is my best option I think. They are running 10.9.2.
Suggestions are welcome for tracking times other than this route as well.
Thanks in advance,

My grandmother is 85 years old.  The Ipad we bought her is primarily used for receiving emails with pictures from us, which are then displayed in the slide show of the screen saver.
Last night my genious brother decided for some reason to upgrade her Ipad to IOS7.  I have no idea why he did that,  but he rendered the Ipad useless for her use.
In the time since the last message was posted on this thread, has anyone found any workaround,  app or anything that can be of help.  Did anyone downgrade to IOS6 successfully?
Please note anything other than the an automatic slideshow including new pictures would not be useful.
I am at a loss and desparately need a solution for this one.

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