I have generate a GUID string for each person who need my workbook.
Stored on Validation.xlsb Workbook (as database) on my computer. (Has public IP address)
Saved specified one in a xlSheetVeryHidden1 for each workbook released to a person.
How Workbook_Open event on destination workbooks (that I wrote), check it's GUID is valid on my VALIDATION workbook, across internet?
The reference for GUID comperision requests are in a workbook on my system. My computer has Public IP address connection. Operation system is Windows 10.
Appreciated.