spyware

from WordNet (r) 3.0 (2006)
spyware
    n 1: computer software that obtains information from a user's
         computer without the user's knowledge or consent
    
from Jargon File (4.4.4, 14 Aug 2003)
spyware
 n.

   1. Software which, when installed by a user insufficiently enlightened
   to avoid it, enables third parties to snoop the user's hard drive or
   monitor their network transactions. Though the term seems to have
   entered use in the late 1990s, it achieved real popularity as applied
   to Microsoft Windows XP. Some {back door} features in XP permit
   Microsoft to (for example) covertly scan your disk directories for the
   names of files it might deem to be {warez}.

   2. Systems for spying on email and web traffic, such as the FBI's
   Carnivore.
    
from The Free On-line Dictionary of Computing (8 July 2008)
spyware
sypware

   <software> (Or "adware") Any type of software that transmits
   information without the user's knowledge.

   Information is sent via the {Internet} to a server somewhere,
   normally as a hidden side effect of using a program.
   Gathering this information may benefit the user indirectly,
   e.g. by helping to improve the software he is using.  It may
   be collected for advertising purposes or, worst of all, to
   steal security information such as passwords to online
   accounts or credit card details.

   Spyware may be installed along with other software or as the
   result of a {virus} infection.  There are many tools available
   to locate and remove various forms of spyware from a computer.

   Some {HTTP cookies} could be considered as spyware as their
   use is generally not made explicit to users.  It is however
   possible to disallow them, either totally or individually, and
   some are actually useful, e.g. recording the fact that a user
   has logged in.

   (http://spychecker.com/spyware.html).

   (2004-05-23)
    

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