Final answer:
Legal use of software tools outside the U.S. may be affected by U.S. encryption export regulations. OpenVAS might fall under these regulations due to its encryption capabilities, while InterMapper, Nmap, and Wireshark typically do not and are therefore less likely to be restricted.
Step-by-step explanation:
The question concerns the legality of using certain software tools in the context of U.S. encryption export regulations. One software tool that may contain encryption capable of falling under U.S. export controls is OpenVAS. This is because OpenVAS includes components that can encrypt communications, which may be subject to regulations. Tools like InterMapper, Nmap, and Wireshark typically do not include encryption capabilities and are mainly used for network mapping, security scanning, and traffic analysis, respectively. Therefore, it's less likely for them to be restricted by encryption export regulations.
However, it is important to consult the current U.S. export regulations or a legal professional for the most accurate information, as regulations can change over time and may vary based on the specific functionalities of the software.