Blocking a user

compucapp

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Dec 2, 2012
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Hi Everyone, Can any one HELP PLEASE?
I am not good at excel, but I sent a file using excel 2007 to a few people and they downloaded it to their desktop.
The problem is I dont want them to have access anymore. HOW DO I BLOCK THEIR ACCESS WHEN THEY OPEN THE FILE ON THEIR COMPUTER. I encrypted it and gave them a password,
PLEASE HELP the file I sent them is very important.
Thanks. Compucapp.
 
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