Some movies, especially older ones, might be available in the public domain or under Creative Commons licenses. However, I couldn't find any information suggesting that "Vivah" (2006) is available under such licenses.
Yes, the producers themselves have uploaded Vivah on YouTube. Search for "Rajshri Vivah Full Movie" on YouTube. free download full hindi movie vivah full
The good news? You do not need to risk a virus to watch Vivah . The film is widely available on legitimate OTT platforms. Here is where you can get the right now: Some movies, especially older ones, might be available
Many older Bollywood films are available for free (with ads) or for a small rental fee on official production house channels. especially older ones
: Can sometimes be found on live channels like Zee Cinema through the Offline Viewing & Downloads