copy_extensions = copy?

[John Douglass]

I noticed this setting in the openssl.cnf file (as of late) and was 
wondering the actual effect of turning this off or on...

# Extension copying option: use with caution.
# copy_extensions = copy
Uncommenting means that we can use things like:

# Import the email address.
# subjectAltName=email:copy
or

# Copy subject details
# issuerAltName=issuer:copy
??

Thanks!
- John Douglass, Georgia Tech
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