Open-Source Deep Packet Inspection
arstechnica.com
arstechnica.com
However, at the very least the open-sourcing of some subset of a commercial DPI product is interesting in that it provides more information than any other company (that I'm aware of, anyway) has revealed on the subject thus far.
edit: Not to say that it alleviates many of the concerns about packet monitoring, but some information is better than no information.
As the article mentioned, the scary part of this technology isn't the technology itself - it is the potential applications of the technology. Any openness coming from a company with an application like this is a positive market pressure.
I'm perfectly fine (and I think most people would be) with certain applications being throttled (to a reasonable extent) as long as I am told up front about it in my ToS, and as long as I know that my data is not being stored anywhere.
A first step to that kind of trustworthiness is more openness as to the filtering software being used.
The state censorship policy in Iran is mainly implemented with transparent web proxies that identify prohibited URLs and redirect to a warning page. Internet users in Iran have become quite adept at bypassing the filters by either using specific circumvention tools or by tunneling their traffic out over VPNs or protocols such as SSL or SSH.
During the protests, the Iranian authorities began to restrict access to specific protocols by throttling them down to a trickle of bytes so that business users could still access some SSL services or foreign VPNs with enough patience, but the channels were no longer usable for mass tunneling to restricted websites.
The traffic throttling is implemented with the same techniques that ISPs use to restrict P2P file trading traffic. It's the exact same DPI vendor hardware.