To use one of Adobe's online subscription services, subscription based applications or subscription base suites you are required to have an active (paid) subscription and an internet connect so that the software used can "call home" periodically.
The "call home" is to verify that the subscription for the Adobe ID used is active.
Subscriptions can be cancelled. Visit customer service for details.
To use a "perpetual" licensed application you have to purchase the license.
Then download, install, activate, register and use.
[moved to the Acrobat.com Services (Japan) forum]