As can be derived from Flash Decompiler Trillix page: http://www.eltima.com/products/flashdecompiler/ the free Demo version limitations are:
- Unlimited time of using trial version
- The resulting FLA files will be stored in grayscale format only
- The resulting FLA file will have nag watermark layer
- ActionScripts are not included in the resulting FLA
- Decompiled ActionScripts cannot be copied to clipboard
- Extraction will only process two objects from each SWF category
- You won't be able to save changes to your Flash files after editing them
- You won't be able to convert Flex files until you register Flash Decompiler