Hi Fellow myonlinetraininghub.com,

I have a problem, i am going to sell my excel files to others, how do i protect the excel files? (i already know the password solution)
but the thing is, i want to secure it every files depends on the user. So if someone distribute it illegally, i will know who did this, based on password input or a watermark on the excel based on their name.. the other problem is if the users are hundreds.. 

Hope you understand my problem..

Regards