>Previous steganography algorithms would subtly change the distribution of the innocuous content, meaning the changes could also be detected. > >To overcome this, the research team used recent advances that allow different sets of data to be sent without the corruption.

??

Like adding another data stream to a media container file like mp4 or alternative media streams or files? That certainly be detectable and obvious something is there.

They say they submitted a patent. Does that mean I can read it? They don't reference or link any.