One of the leading e-commerce fraud-prevention firms, 41st Parameter Inc., has begun testing its device-fingerprinting techniques with several online-ad companies.

反电子商务诈骗公司领头羊之一的“41st Parameter”（41st Parameter Inc.）已经开始在几家在线广告公司上测试他们的数字指纹设备。

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But in some cases, one marketer's owned media become another marketer's paid media—for instance, when an e-commerce retailer sells ad space on its Web site.

但在某些情况下，某市场营销者的自有媒介会成为另一个营销者的付费媒介。比如，当某电子商务零售商出售其网站上的广告空间时。

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But in some cases, one marketer's owned media become another marketer's paid media - for instance, when an e-commerce retailer sells AD space on its Web site.

在某些情况下，某营销者的自有媒介会成为另一个营销者的付费媒介。

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The idea for its commercial, however, may not be one cooked up by E-Trade ad agency Grey Group.

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One unit, curiously called Chaos to Order, went after e- business from ad agencies as others pursued similar opportunities elsewhere.

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The ads are selected to match the subject matter of the e-mail, with Google's ad-placement software picking up on certain key words.

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