It's formulaic legal language. The part between brackets to my mind is entirely optional, if you want to be more literal, but it is not absolutely necessary.

http://www.sc-sl.org/LinkClick.aspx?fileticket=rg16pptE5Vo=&...
By virtue of the foregoing, and leaving aside for the present the question of the criminal. responsibility of the Accused, the Trial Chamber is satisfied ...

http://books.google.com.uy/books?id=fuFjNv1bsTQC&pg=PA221&lp...
by virtue of the foregoing statement = por lo anteriormente expuesto

http://www.ilsos.net/departments/securities/administrative_a...
That by virtue of the foregoing, John Francis Zelasko is. subject to a fine of up to $10000.00 per violation and. an order which permanently prohibits the ...

http://www.cyberdriveillinois.com/departments/securities/adm...
By virtue of the foregoing, Respondents violated 12.D of the Act. Fraud. 20. In fact, Respondents never deposited Investor's money in a pool that purchased ...

http://www.privacy.gov.au/publications/casenotes/ccn1_05.doc
the Commissioner sent amended copies of the report (that had been denied on the above grounds) to the complainant and decided subsequently to cease further ...

http://www.publicguardian.gov.uk/docs/lpa001-fillable.pdf
The Court will only consider objections made if they are made on the above grounds. To obtain a Court. objection form please contact the Court of Protection ...