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seen Feb 4 '12 at 19:55

Jul
10
awarded  Popular Question
Feb
6
awarded  Student
Feb
4
comment How are timestamps verified?
It is important that I just noticed that my document was written in lyx(latex) and I checked before timestamping in .lyx format and after it in pdf format, I am almost sure example.pdf does not change and they just give you another file and you keep the original as It was.
Feb
4
asked How are timestamps verified?