"crazeles" is the code name of patch(es) that planetbeing wrote for the 5.0.1 jailbreak to fix the FairPlay jailbreak detection, so that DRM protected iBooks work again. This is similar to the hunnypot patch(es).
References
- Sandbox Patch
- hunnypot
- Dev Team blog [Archived 2012-01-18 at the Wayback Machine] (see update #5)