Acme.buy_rockets <- Acme.preferred_customer
Acme.preferred_customer <- Coyote

creddy --generate --cn Acme

creddy --generate --cn Coyote

creddy --attribute \
       --issuer Acme_ID.pem --key Acme_private.pem --role buy_rockets \
       --subject-cert Acme_ID.pem --subject-role preferred_customer \
       --out Acme_buy_rockets__Acme_preferred_customer_attr.der

creddy --attribute \
       --issuer Acme_ID.pem --key Acme_private.pem --role preferred_customer \
       --subject-cert Coyote_ID.pem \
       --out Acme_preferred_customer__Coyote_attr.der