Yes
Both Do What The F*ck You Want To Public License and ISC License are permissive licenses with minimal obligations. Combining code under them is straightforward; ensure the original copyright notices are preserved alongside any new ones.
| License | Family | Patent grant |
|---|---|---|
| Do What The F*ck You Want To Public License (WTFPL) | permissive | No (implicit at most) |
| ISC License (ISC) | permissive | No (implicit at most) |
Do What The F*ck You Want To Public License: Effectively public-domain; widely used informally but considered legally weak by some lawyers.
ISC License: Functionally equivalent to MIT; Internet Systems Consortium's house license.
If you found this page because you're trying to figure out whether shipping a particular dependency is safe, the answer above is a starting point — not a substitute for reading the actual licenses or talking to a lawyer when stakes are high.
LicenseHound walks every transitive dependency in your repo, maps each to its SPDX license, and flags pairs like this one in PR comments. The CLI is free; the team dashboard is paid.