The official Protel support lines for Circuit Maker 2000 were shut down around 2005 when Altium fully migrated to its own platform. You cannot call the old numbers. However, the internet never forgets. Here are the legitimate (and historically interesting) sources.
Before we hunt for the access code, it is worth understanding the software’s place in history. Released in 1999, Circuit Maker 2000 (often abbreviated CM2K) was the successor to Circuit Maker 6.0. Circuit Maker 2000 Access Code
Fast forward to today. Circuit Maker 2000 is technically "Abandonware." The original developers, MicroCode Engineering, were acquired by Altium (who now makes much more expensive software). Altium has zero interest in supporting a 20-year-old product. The official Protel support lines for Circuit Maker
However, the software is still useful. It is lightweight, runs on minimal hardware (even inside virtual machines), and opens legacy files that modern tools sometimes struggle to parse. It is a piece of engineering history. Fast forward to today
Here lies the problem: Digital Rot.
When a retro-computer enthusiast tries to install an original copy of Circuit Maker 2000 today, they often hit the access code wall. Because the software is so old, there is no "Forgot Password" button, no server to call home to, and no customer support line to beg for a key.
This leads to the fascinating role of the "Crack Scene." Ironically, the only way to preserve this software for historical study is often to bypass the very protections that made it valuable. The "access code" write-ups found on modern archive sites are rarely the original developer codes; they are usually the remnants of reverse-engineering efforts by groups like "Paradox" or "Float," who stripped the DRM years ago to make the software usable.