I actually completed hundreds of paid projects and hundreds more in house and I can tell you that this is a waste of time and not doable.

first never trust an OP with 10 posts asking your to do something and then show them how its done

second there is no feasible way to do this

even if you cracked the encryption, this is just a user editable key so the second the logs have a download without a matching user, all the admin has to do is change the encryption by one byte and you're back to starting over. If spitting out decryption keys was as easy as he thinks why not hit Bank of America instead of a loser mp4.