I have so many copies (photocopies) of BDM certificates - including my own - that are passed between family members as part of our research. I would copy it & I would send it to the person concerned (actually if it isn't your family, you may just want to send them the original).
I have yet to see why I have to pay the purchase price of a certificate owned by a family member. When my father died recently, the funeral director ordered the death certificate & then made a number of copies (which a JP certified).
When my solicitor wanted the original, he made 2 more copies for me (& also certified same). When I visited places such as banks/insurance companies to sort out accounts, policies etc - the first thing they did was photocopy the certificate!
So I'm not sure where copyright comes into this one

Trish