Custom Protocol Handling

It's not entirely clear what you're wanting to do, but you could possibly set up an roSystemLog and listen for the http.connect event for the specific URI you want to react to.

Sorry essentially we have a HLS encrypted string but the encrypted key location is defined by a custom URL scheme. so when the player intercepts the encrypted stream and see's the custom url it processes it and uses the resulting key to play the Encrypted HLS Stream.

If you are able to read the .m3u8 as a text file, assuming it is not encrypted or that you can somehow decrypt it, then you should be able to look at what is in it. You could use roUrlTransfer:

function getline(url_to_get as string) as string
     xfer=createobject("roURLTransfer")
     xfer.seturl(url_to_get)
     result=xfer.gettostring()
     result=result.tokenize(chr(10))
     For each line in result
          if instr(line,"string value") > 0 then return line
     end for
     return ""
end function