As AnemicOak says, rename from .azw to .mobi (or .prc) and try to open using any MOBI Reader.
There is a 2-byte int near the start of the file that are either set to 0 (no DRM) or 2 (standard DRM). This is one of the checks that kindlefix.py uses when "fixing" a MOBI file (there is obviously no need to fix a Kindle AZW file, but the needed check is in this python script). So if should be easy for someone to write an "isdrmfree" script. Unfortunately my Python skills are below novice level.
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