GPLv2. This is OK, as only the tools themselves are licensed this way, the
output of the tools is not considered a derived work, and so can be safely
licensed for Wireshark's use. An incomplete selection of these tools includes:
- - the html2text utility (tools/html2text.py) is licensed under the GPLv3.
- the pidl utility (tools/pidl) is licensed under the GPLv3+.
Parts of Wireshark can be built and distributed as libraries. These