The HI-TECH Z80 CP/M C compiler V3.09 is provided free of charge for any use, private or commercial, strictly as-is. No warranty or product support is offered or implied.
You may use this software for whatever you like, providing you acknowledge that the copyright to this software remains with HI-TECH Software.
-- From the HI-TECH Software web site (now defunct) - a copy of which is on the Wayback Machine at
https://web.archive.org/web/20000301031041/http://www.hitech.com.au/