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AdGuard is an ad-blocking software that can be downloaded and installed on Android devices. It is available for free, but there is also a premium version that offers additional features. According to a post on Yahoo! Chiebukuro, the free trial of AdGuard does not automatically cancel after the trial period ends, and users will be charged for the premium version. However, it is unclear from the search results whether users continue to pay for the premium version after the trial period or if they switch back to the free version. AdGuard licenses are provided based on an End User License Agreement (EULA) and can be in the form of a license key, activation code, or a card associated with the user's AdGuard account. The AdGuard for Android app must be manually installed from the AdGuard website due to restrictions on the Google Play Store. There is a thread on 5ch.net where users discuss AdGuard and its effectiveness in blocking ads on Android devices.