How can I decrypt the video?

[benvgaming]

I'm trying to do add dynamic watermark with aes-128 encryption. But right now I'm unable to add watermark with ffmpeg since the .ts files are encrypted. I tried to decrypt it with ffmpeg and openssl but it didn't work. Here's my code block:

    location /vod/ {
        alias /opt/vod/;
        
        # VOD module settings
        vod_bootstrap_segment_durations 4000;
        vod hls;
        vod_mode local;
        vod_secret_key "0123456789abcdef0123456789abcdef";
        vod_hls_encryption_method aes-128;
        
        # CORS headers
        add_header Access-Control-Allow-Headers '*' always;
        add_header Access-Control-Expose-Headers 'Server,range,Content-Length,Content-Range' always;
        add_header Access-Control-Allow-Methods 'GET, HEAD, OPTIONS' always;
        add_header Access-Control-Allow-Origin '*' always;
        
    }