I was wanting to watch some of the talks at some of the these events. And came across both GDC Vault and Siggraph Encore. Siggraph allows you to buy their content but GDC doesnt unless you actually went and have a pass, which I find rather annoying to say the least. I know that both offer slideshow presentations and pdfs, and that ENcore allows you to purchase audio, but watching the videos with everything in sync is far more enjoyable. So are these my only options?