SSL certificate on forum

Could somebody from this forum / Sinovoip administration team explain why there is no SSL certificate assigned to this site / domain?

Also, could somebody explain why this domain is registered to the company SINOVIP CO.,LIMITED and not SINOVOIP CO.,LIMITED?

I am also interested about the relationship between Sinovip Co. Ltd. / Sinovoip Co. Ltd. and Shenzhen Wanwei Internet Information Technology Co. Ltd.