Yes, you can use my blog content freely. I would appreciate it if you cite me, but it's okay if you don't.
Images: I draw most of my images by hand using Inkscape.
Paper Content: The paper summaries are paraphrasings of the original papers, most of which are freely available on arXiv.
All the external media content, including my talk slides, external PDFs are my copyright and are meant only for your viewing. Please contact me if you need to use any of these.