Can Excel recognize code I didn't write?

[Guest]

Created a file with some macros in it, tested it, then gave it to one of our
floor reps for day-to-day testing. File was fine, but back from lunch and she
reported that opening it now generates error message. Error message is:

"The macros in this file do not match the digital signature. Only a macro
virus would cause this. Please scan for viruses, and notify the publisher of
this document. Macros will be disabled."

The problem is gone since I removed two modules with extraneous, preliminary
code. But I'm curious as to the source. The project is digitally signed in my
name. Can Excel recognize code at a sub-project level? If so, I did copy some
code from 2007 posting to this NG into the spreadsheet, and it was on one of
the modules I removed. Could Excel really have recognized that as not
belonging to me?

If anyone can help understand, appreciate it.

 

[Guest]

That is the message that pops up because of the security settings on that
computer.
She will need to adjust her secutity level downward, probably low, to avoid
the message.