Is BSD-2-Clause compatible with ISC?
Yes.
Combine freely; retain all notices. Result can be relicensed (kept proprietary) downstream. Result license is the more restrictive of the inputs. You must satisfy every input license's notice and source-offer terms. Verify pairwise compatibility first.
Resulting work's license: BSD-2-Clause
General guidance, not legal advice.
Obligations when redistributing as open source
- BSD-2-Clause: retain the copyright notice and license text.
- ISC: retain the copyright notice and license text.
Other distribution models
The verdict is the same under every distribution model; the obligations differ. Check this pair in the tool to switch models.