There is NO 100% secure way - not even a 90% secure way.
There are many ways that applications use to copy files - even
memory sharing between two applications which you cannot take into
account as a way.
While MOST applications, by definition of copy, also set the Last
Modified time of the destination file to the time of the source file,
this isn’t always true.
–
Kind regards, Dejan M. MVP for DDK
http://www.alfasp.com E-mail: xxxxx@alfasp.com
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