If you lost a legitimate key for Vegas 7.0 and have proof of purchase, contact Magix support (they acquired Sony’s creative software in 2016). They may assist with license recovery, though for very old versions, replacement keys aren’t guaranteed.
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However, I can offer useful, legal information: If you lost a legitimate key for Vegas 7
If you have old .veg project files from Vegas 7.0: though for very old versions
