An indoor camera system can be just as effective for providing specific room coverage as an outdoor camera system can in providing outdoor building perimeter coverage.  Indoor camera systems have many more applications than just theft prevention and documentation.  For example, an indoor camera system can also be a baby monitor, a patient monitor, a pet monitor, and an alarm system itself.

Actually there is very little difference between an indoor camera system and an outdoor camera system.  The biggest difference between the two is that indoor camera systems may not contain the proper protection necessary to withstand weather and other natural elements.