Who needs management permission? If you're the only developer, concurrent editing isn't a big problem, so just install something locally on your machine.
I was the sole perl guy at my work this past summer, so I installed TortoiseSVN (a Windows Subversion package) on my first day and used it locally while I was there. Simple as hell to use, and had nothing to worry about when I accidently deleted important files. Plus, it made versioning so much easier, just use the SVN version. :)
Update: looks like I'm preaching to the converted. Congratz