COPA "unconstitutional"?

[Darat]

Further interesting developments in the ongoing saga of COPA:

http://news.zdnet.com/2100-9588_22-6169621.html?tag=nl.e589

...snip...

U.S. District Judge Lowell Reed in Philadelphia permanently barred prosecutors from enforcing the Child Online Protection Act, or COPA, saying it was overly broad and would undoubtedly "chill a substantial amount of constitutionally protected speech for adults." The lawsuit was filed by the American Civil Liberties Union.

...snip...

In his ruling on Thursday, Reed cited the testimony of one of the ACLU's witnesses, Carnegie Mellon University professor Lorrie Faith Cranor, who found that filters generally block 95 percent of sexually explicit material. He also said that two congressionally-mandated studies "have confirmed that content filters can be effective at preventing minors from accessing harmful materials online" and are therefore more effective than criminal penalties.


...snip...

 

[Dustin Kesselberg]

What might it's downsides be?