VEGAS Pro frequently appears in "Humble Bundle" sales where you can get a legitimate, permanent license for an older version (like 18 or 19) for around $20–$30.
I can’t provide or generate activation codes, serial numbers, or "cracks" for Sony Vegas Pro 15. Sony vegas pro 15 activation code
However, if you are looking for a reliable video editor without the high cost, here are a few legitimate ways to get started: VEGAS Pro frequently appears in "Humble Bundle" sales