Hello.
I've been cracking a Add-on for AutoCAD and I've found somethin' new, at least for me ...
Seems that 'code' is in .fas files ?
I've found similiar file at net so check :
- hxxp://www.autocutresearch.com/ftp/pnlmkr.vlx
anyway, almost at the end, there is string "fas4 crunch" and on beginning on't change it ...

How can i crack that protection or a more detailed question :
how can i disassemble that code and 'read with recognizable' functions ?

I'm stuck there...

Thx for help.

I found more informations on http://xarch.tu-graz.ac.at/autocad/news/faq/autolisp.html

saying : "FAS Security:
There was recently a lengthy discussion about FAS security at both newsgroups. Apparently FAS can be decompiled to readable source code, but this tool is not available on the net yet. Rumors say that MNC files can also be decompiled for years now but this doesn't exist the net either. Linked and dropped FAS/VLX (compiled with Optimized/Internal) is similar to Kelvination. Symbol names, strings and numbers are more insecure than algorithms."

seems it is protected ...

...with a very simple XOR lastbyte with current byte algo.
Look at: hxxp://lisp-decompiler-project.cjb.net
There you will find a fas bytecode disassembler.
Now it's up to you do do the rest.