Are cancelled stamps public domain?

Are cancelled stamps public domain? 
This is an interesting, though completely esoteric, question. 
Google Answers has a relatively comprehensive answer that may be helpful. 
Although we can’t attest to the validity of this answer without more independent research, we felt that the discussion seemed credible.
If you have any questions about whether a specific stamp is now in the public domain and is available for reuse, reproduction or remixing, feel free to contact New Media Rights via our contact form to find out whether you qualify for free or reduced fee legal services. We also offer competitive full fee legal services on a selective basis. For more information on the services we provide click here.
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