How to protect my SQL Server database from unauthorized access, modification and distribution?

Question

What are the ways to protect SQL Server without using third-party tools and not lose performance?

[EDIT]

I do not want to see, modify, copy and attach, copy and restore other servers. Only my application can perform these operations. Even from system admins

Answer 1

There are many ways to do this, it really depends on the type of protection you want, here are some of my ideas.

By protecting unauthorized access, you can:

Encrypt ConnectionStrings in web.config file (if .net)

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Answer 2

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