USA FBI PCCs are not hand-signed, but only printed. Original PCC is what the site says, nothing about a signed copy. So I am sure this should be accepted too as it is issued by police / government. Below is from CIC site:
Police certificates
All applicants must submit police certificates/clearances as part of the application process.
You and all of your family members who are 18 years of age and older and who are not already permanent residents or Canadian citizens will have to provide:
•a valid police certificate, or
•police clearance, or
•record of no information.
These documents are to be provided for each country other than Canada, in which you have lived for six consecutive months or longer since reaching the age of 18.
Note: If you or your family members were under 18 years of age (16 years of age in certain jurisdictions) for the entire time you lived in a particular country, you do not need to provide a police certificate for that country.
Before submitting your application to the CIO, you should:
•research the estimated length of time required to obtain police certificates from all of the applicable jurisdictions, and
•begin to gather your police certificates.
Note. We strongly recommend that you submit your police certificates with your application to the CIO. If you are unable to obtain all the necessary police certificates, you may still send your application to the CIO without them. However, please note that if your application is placed into processing you must be ready to submit them to the visa office when requested.
Note: If you are including your police certificates with your application to the CIO, please ensure that your certificates were not issued more than three months earlier. Police certificates are generally valid for 12 months from the date they are issued. However, if a final decision is not made on your application before the expiry of your police certificate, the visa office may request that you provide a new one.
http://www.cic.gc.ca/english/information/applications/guides/EG7TOC.asp