Scanned magazines (like Televi-Kun) and behind-the-scenes materials.
This is where the conversation gets complicated. The exists in a precarious legal limbo. zyuranger internet archive
Research the and where to find their instruction manuals. zyuranger internet archive
The "Sentai" footage contains stunts and pyrotechnics that were often trimmed for American censors. Navigating the Archive zyuranger internet archive