403. That’s an error.
Your client does not have permission to get URL /videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=5daf58497f6e2194&itag=18&source=picasa&cmo=secure_transport%3Dyes&ip=0.0.0.0&ipbits=0&expire=1420307364&sparams=requiressl,shardbypass,cmbypass,id,itag,source,
from this server. That’s all we know.