Data Retention More Complicated, Expensive Than Previously Understood |
Center for Democracy & Technology
CDT has concluded that changes in the Internet addressing practices of ISPs
and mobile carriers make data retention far more complicated and much more
expensive than previously understood, while at the same time reducing the
reliability of IP addresses in identifying individual users.  We've issued
a memo detailing this new perspective on the data retention mandate.

The problem is this: The IP addresses associated with communications
traversing the Internet no longer uniquely identify end-user devices.
 Because of the shortage of IP addresses, Internet access providers are
beginning to use a technique called Network Address Translation to share
addresses among multiple users.



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Source:
http://www.cdt.org/blogs/greg-nojeim/1612data-retention-more-complicated-expensive-previously-understood
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