In my previous post about WolframAlpha, I compared it with Google where I mentioned that it is a great resource for research analysts.
Few snippets are below:
"The free Wolfram|Alpha service is available for ad hoc, personal, non-commercial use only." ...
"If you make results from Wolfram|Alpha available to anyone else, or incorporate those results into your own documents or presentations, you must include attribution indicating that the results and/or the presentation of the results came from Wolfram|Alpha. ..."
"Failure to properly attribute results from Wolfram|Alpha is not only a violation of these terms, but may also constitute academic plagiarism or a violation of copyright law. Attribution is something we expect you to give us in exchange for us having provided you with a high-quality free service."
There are not many such hassles with Google.