M3U8 + AES Encryption Key

I'm trying to play an m3u8 file that is encrypted. The m3u8 has an AES key file that is used to decrypt the stream.

How would I go about applying that AES key file into the following code in order to have the file decrypted for Roku to play it? NOTE: This code was initially created for an m3u8 file that was not encrypted. I basically need to understand what line(s) to add in order for the decryption to take place.

Sub RunUserInterface()
    screenFacade = CreateObject("roPosterScreen")
    screenFacade.show()
    
    port = CreateObject("roMessagePort")
    videoScreen = CreateObject("roVideoScreen")
    videoScreen.setMessagePort(port)
    videoScreen.SetPositionNotificationPeriod(10)
    
    videoclip = {}
    videoclip.StreamUrls = ["URL.m3u8"]
    videoclip.StreamFormat = "hls"
    videoclip.ContentType = "movie"
    videoclip.title = "MOVIE"
    videoclip.StreamBitrates = [0]
    videoclip.playstart = 0
    videoclip.StreamQualities = ["SD"]
    videoclip.SwitchingStrategy = "full-adaptation"
    videoScreen.SetContent(videoclip)

    videoScreen.show()
    nowpos = 0
    while true
        msg = wait(0, port)
        if type(msg) = "roVideoScreenEvent"
            if msg.isScreenClosed() then 'ScreenClosed event'
                print "Closing video screen"
                exit while
            else if msg.isPlaybackPosition() then
                nowpos = msg.GetIndex()
                print nowpos
            else if msg.isRequestFailed()
                print "play failed: "; msg.GetMessage()
            else if msg.isFullResult()
                print "isFullResult"
            else if msg.isPartialResult()
                print "isPartialResult, nowpos = ";nowpos
            else if msg.isStreamStarted()
                print "isStreamStarted"
            else
                print "Unknown event: "; msg.GetType(); " msg: "; msg.GetMessage()
            end if
        else
            print "Event: ";type(msg)
            print msg.GetInfo()
        end if
    end while

    print "Exiting app"
    screenFacade.showMessage("")
    sleep(25)
End Sub