DRM protected videos ,fairplay certificate

i have video playing server and for that fairplay need to be integrated for DRM Protectcted videos,. My Streaming server needs from my side


An ASK file (Application Secret Key)

A Fairplay certificate in either .cer or .der format

A private key in .p12 format .


i have ASK Key and csr file also which is used create fairplay certificate i dont have private key because the certificate creation done in our vendors Macbook so thats why whenever i download fairplay certificate in my Keychain access there is no private key belongs to certificate , so what to do now to get private key, i even tried exporting apple id and keychain acess preference from that mac still i dont see private key with that certificate, please help me ASAP,

DRM protected videos ,fairplay certificate
 
 
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