403. That’s an error.
Your client does not have permission to get URL /videoplayback?requiressl=yes&id=f42c8615b1738536&itag=18&source=picasa&cmo=secure_transport=yes&ip=0.0.0.0&ipbits=0&expire=1435277401&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=BE6B1FC7381E2BB7C1BC76130
from this server. That’s all we know.