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Are you asking about Wondershare Safeeraser? or is it Laplink Software you are asking about?
If Laplink, the serial # is found on a sticker, on the CD sleeve:
Note: If you purchased Laplink SafeErase v4 or v6, as a download, then look in your email account around the time you purchased it... the serial # is in a receipt email from Laplink in that case.
The serial # should begin with EAN or perhaps EPN, if it is Laplink SafeErase.
Does this answer your question?
Do you still have your email account from the time when you bought SafeErase?
Have you done a Search for any mention of
in it, and looked at all the emails found?