Your active digital footprint consists of the information that you intentionally share online or that occurs as a result of your online activities. Here's a breakdown of the items you listed:
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Adware that secretly tracks your buying behavior online - This contributes to your passive digital footprint because it tracks your behavior without your active consent or knowledge.
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Personal information you intentionally enter into a secure website when making a purchase - This contributes to your active digital footprint, as it involves your direct input and consent.
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Personal data from public records such as home sales - This is generally part of your passive digital footprint, as it is information collected without your direct actions, although it is publicly available.
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Information about you from online newspaper articles - This can be part of your passive digital footprint since you may not have control over how this information is published or shared, but if you contributed to the articles or shared related information yourself, it could overlap with your active footprint.
In summary, only item 2 directly contributes to your active digital footprint.