403. That’s an error.

Your client does not have permission to get URL /videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=4d4729740a3562b7&itag=18&source=picasa&cmo=secure_transport%3Dyes&ip=0.0.0.0&ipbits=0&expire=1429949357&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=423F400E5F64FAF4AFC720BCB255253FE4D231F7.1C0C727A9E8862723B792F53BE6E4D1B16135F6C&key=lh1 from this server. That’s all we know.