A little fact checking...
I am assuming a copy is okay since it has the required info on it. I tend to lock up my originals to make sure I don't lose them! You can lend the firearm if you lend the certificate as well, but you can't lend the certificate, because only the owner is supposed to have that. You could have a problem then, if you are the registered owner, but you don't have the certificate!! I wouldn't lend a restricted, too much room for s***t to hit the fan~!!!
Dunki, I'm not trying to start a war or anything; just straightening out the facts.
The firearms act states that:
16. (1) A registration certificate for a firearm may be
issued to only one person.
It says
nothing about only the owner having possession of it. The act also goes on to say:
33. Subject to section 34, a person may lend a firearm only if
(a) the person
(i) has reasonable grounds to believe that the borrower holds a licence authorizing the borrower to possess that kind of firearm, and
(ii) in the case of a prohibited firearm or a restricted firearm,
lends the registration certificate for it to the borrower; or
(b) the borrower uses the firearm under the direct and immediate supervision of the person in the same manner in which the person may lawfully use it.
1995, c. 39, s. 33;2012, c. 6, s. 14.
So as long as you cross all your t's and dot all your i's you should be fine. Keeping in mind, of course, that the person you lend to will either require a STATT or a LTATT that does not specify particular firearms or firearms registered to his/her address. It seems depending on where you are, LTATTs are worded differently.
Source: http://laws-lois.justice.gc.ca/eng/acts/F-11.6/index.html