-"repository creator can declare until then the data provided in the "
-"repository should be considered valid and if this time is reached, but no "
-"new data is provided the data is considered expired and an error is raised. "
-"Beside increasing security as a malicious attacker can't sent old data "
-"forever denying a user to be able to upgrade to a new version, this also "
-"helps users identify mirrors which are no longer updated. Some repositories "
-"like historic archives aren't updated anymore by design through, so this "
-"check can be disabled by setting this option to <literal>no</literal>. "
-"Defaults to the value of configuration option <option>Acquire::Check-Valid-"
-"Until</option> which itself defaults to <literal>yes</literal>."
+"repository creator can declare a time until which the data provided in the "
+"repository should be considered valid, and if this time is reached, but no "
+"new data is provided, the data is considered expired and an error is "
+"raised. Besides increasing security, as a malicious attacker can't send old "
+"data forever to prevent a user from upgrading to a new version, this also "
+"helps users identify mirrors which are no longer updated. However, some "
+"repositories such as historic archives are not updated any more by design, "
+"so this check can be disabled by setting this option to <literal>no</"
+"literal>. Defaults to the value of configuration option <option>Acquire::"
+"Check-Valid-Until</option> which itself defaults to <literal>yes</literal>."