decrypting theme, not your usual eval or base64 ..strange one this …

Where did you download this theme from? We don’t recommend using encrypted themes period.

There may be other places – in particular, vendors on this list:

Commercially Supported GPL Themes

may also offer free themes – and they’d likely be “trusted.” However, these forums only support the themes from the repository on this site – so if you use one from someplace else, make sure it’s supported.