Yes, there are some restrictions on when and how you can view web cameras. Generally speaking, most public web cameras will be available for viewing at any time of day or night as long as they are not obscured by weather conditions such as fog or snow. However, private security cameras may have limited operating hours during which they can be accessed or their feeds viewed online. Additionally, it is important to note that the majority of web camera footage is owned by the individual who installed them so if you wish to access this information legally then you must first obtain permission from the owner before doing so.