Product Activation is the process through which a product (usually computer software) is activated. Most computer software require some activation (computer games usually require CD-keys or serial numbers, while Windows XP requires a complex licensing process). Many software (including Windows XP) have been criticized for their lengthy and sometimes time-wasting activation processes. Also, pirating techniques have become more sophisticated, making product activation close to useless.

Software that require users to activate online or by phone include:

See also: Digital rights management