I heard that 20th Century Fox Television (now Disney's 20th Television) used to distribute the series on syndication. I searched every nook and cranny for whoever owns the current rights. Wikipedia is a terrible source of information because it is edited everyday and sometimes getting it wrong. Searched Entertainment Rights' website through the Wayback Machine (which lists every cartoon they own, including all of the Filmation cartoons that would eventually fall under ownership of NBCUniversal's television division through DreamWorks Animation's Classic Media subsidiary) and I couldn't find the 1969 series on Entertainment Right's webpage on their list... I need investigation from a reliable source that isn't easily edited like Wikipedia. I know for sure Sony Music owns the recordings, while the 20th Television webpage requires signing up. Episodes have popped up on YouTube, but they're (pretty aged) film prints from the 1970s and 1980s but without the credits leaving me with no clue who owns the Filmation series.
Sorry for posting this again, I just posted this on the wrong thread which is why.