There are many reasons to use SVN, but I don’t think that “preventing your code from being scanned” is one of them.
If your development areas and code can be crawled by search engines, you are facing a serious system administration problem. There are dozens of solutions to this problem ... IP white lists, HTTP authentication for each site, ACLs for each domain, etc. HTTP Auth takes 5 seconds to configure ... you really need to do something.
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