It has to be the ORIGINAL. This is from the Buffalo PDF Instructions (page 4):
http://www.cic.gc.ca/english/pdf/kits/guides/E37048.pdf
8. PROOF OF LANGUAGE PROFICIENCY
Refer to instructions in the "Proof of your language abilities" section of our
Web site. If you are claiming proficiency at any level in English and/or French,
submit one of the following:
• Test results from an approved language-testing organization: We strongly
recommend that you submit test results if you are claiming proficiency in a
language that is not your native language. You must provide the original.
Photocopies are unacceptable. Language test results must not be older than one
year upon submission.