SA is an all powerful user. Even if you change the owner SA still can do anything with them. Treat the root cause and assign a strong SA password. I really cannot assess the impact of what assigning an SA password in your environment will be. However, worst case you could always change it back to blank (shock horror) if you discover any issues until you resolve them. The fact databases are owned by sa is not going to be affected by a password change.
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This was first published in February 2003