Abstract: The present invention relates to an information processing apparatus typified by a personal computer and the like and employs a versatile technique capable of preventing unauthorized use of software effectively. An information processing apparatus has a storage section which stores software at least part of which is encrypted; a media mounting section on which a storage medium containing a key for use to decrypt the software stored in the storage section is removably mounted; a decryption section which decrypts the software stored in the storage section using the key contained in the storage medium mounted on the media mounting section; and a computing section which executes the software decrypted by the decryption section.

Abstract: A liquid feed apparatus which returns liquid to a tank by emptying a common pipe to prevent mixing of liquids. The liquid feed apparatus further does not display the amount of liquid in the feed pipe at the beginning of the liquid feed from the nozzle to prevent any error in liquid feed amount.