The present disclosure includes disclosure generally related to digital watermarking and steganographic encoding. One claim recites an apparatus including: electronic memory for buffering data representing video or imagery; and an electronic processor. The electronic processor is programmed for: analyzing the data representing video or imagery, the video or imagery comprising digital watermarking hidden therein through alterations, the digital watermarking comprising content classification information; decoding the content classification information from the digital watermarking; and controlling display or rendering of the video or imagery in response to the content classification information. Other combinations are provided and claimed as well.