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Regulating Online Speech. Week 3 - January 30, February 1. Administrivia. Questions about retaking the quiz? Questions about proper citations and avoiding plagiarism? Homework #2 now posted Homework 1 discussion.

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regulating online speech

Regulating Online Speech

Week 3 - January 30, February 1

  • Questions about retaking the quiz?
    • Questions about proper citations and avoiding plagiarism?
  • Homework #2 now posted
homework 1 discussion
Homework 1 discussion
  • How would your life be different without computers?
cmu libraries http www library cmu edu

Research and Communication Skills

CMU Libraries (
  • Engineering and Science (a.k.a. E&S)
    • Location: 4th floor, Wean Hall
    • Subjects: Computer Science, Engineering, Mathematics, Physics, Science, Technology
  • Hunt (CMU’s main library)
    • Location: its own building (possibly 2nd ugliest on campus behind Wean), between Tepper and Baker
    • Subjects: Arts, Business, Humanities, Social Sciences
  • Software Engineering Institute (a.k.a. SEI)
    • Location: 4500 5th Avenue
    • Subjects: “Security, Software, Technology”
coolest thing in cmu libraries

Research and Communication Skills

Coolest Thing in CMU Libraries
  • Posner Memorial Collection at Posner Center
    • Rare books
    • Early prints of famous works
    • Original copy of the Bill of Rights
start here cameo

Research and Communication Skills

  • Cameo is CMU’s online library catalog
  • Catalogs everything CMU has – books, journals, periodicals, multimedia, etc.
  • Search Cameo online at
if it s not in cameo but you need it today local libraries

Research and Communication Skills

If it’s not in Cameo, but you need it today: Local Libraries
  • Carnegie Library of Pittsburgh
  • University of Pittsburgh Libraries
if it s not in cameo and you can wait illiad and e zborrow

Research and Communication Skills

If it’s not in Cameo, and you can wait: ILLiad and E-ZBorrow
  • ILLiad and E-ZBorrow are catalogs of resources available for Interlibrary Loan from other libraries nationwide (ILLiad) and in Pennsylvania (E-ZBorrow)
  • Order items online (almost always free)
  • Wait for delivery – average 10 business days
  • Find links to ILLiad and E-ZBorrow online catalogs at
special needs other useful databases

Research and Communication Skills

Special needs: Other Useful Databases
  • Links to these and many more databases available at
  • Lexis-Nexis
    • Massive catalog of legal sources – law journals, case law, news stories, etc.
  • IEEE and ACM journal databases
    • IEEE Xplore and ACM Digital Library
  • INSPEC database
    • Huge database of scientific and technical papers
and of course

Research and Communication Skills

And of course…
  • Reference librarians are available at all CMU libraries, and love to help people find what they need – just ask!
bill of rights
Bill of Rights
  • First Amendment
    • Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
the internet can t be censored
The Internet can’t be censored

“The Net treats censorship as damage and routes around it.”

- John Gillmore

actually none of this is true
Actually, none of this is true
  • It is easy to adopt a pseudonym or a persona on the Internet, but it is difficult to be truly anonymous
    • Identities can usually be revealed with cooperation of ISP, local sys-admins, web logs, phone records, etc.
  • The Internet can put up a good fight against censorship, but in the end there is still a lot of Internet censorship
    • Repressive governments and intellectual property lawyers have been pretty successful at getting Internet content removed
communications decency act
Communications Decency Act
  • Title V of the Telecommunications Act of 1996
  • Prohibited Internet distribution of indecent or patently offensive material to minors
  • Created restrictions for the Internet similar to broadcast media
  • Introduced by Sen. James Exon (D-Nebraska)
    • Cited Marty Rimm study
  • Immediately challenged in court
  • Supreme Court struck down CDA in 1997 (Reno v. American Civil Liberties Union)
opposition to the cda
Opposition to the CDA
  • Over-broad, vague, unenforceable
  • CDA includes “indecency standard”
    • Obscenity and child pornography are already illegal to distribute (child pornography is also illegal to possess)
    • Obscenity - Miller test:
      • Whether the average person, applying contemporary community standards, would find that the work, taken as a whole, appeals to the prurient interest,
      • Whether the work depicts/describes, in a patently offensive way, sexual conduct specifically defined by applicable state law,
      • Whether the work, taken as a whole, lacks serious literary, artistic, political, or scientific value.
    • But indecency is defined in CDA as “any comment, request, suggestion, proposal, image, or other communications, that, in context, depicts or describes, in terms patently offensive as measured by contemporary community standards, sexual or excretory activities or organs.”
      • What community do we look at when regulating the Internet?
  • Internet should not be regulated like broadcast
  • Law would chill free speech
  • Internet filters are a better solution
support for the cda
Support for the CDA
  • Senator James Exon (D-Nebraska), sponsor of Bill: Need to protect children from online pornography
  • Laws that restrict selling porn to children in other media should apply to the Internet
  • Filters are not sufficient
    • Parents may not be able to figure out how to use them
    • Children may access computers away from home
platform for internet content selection pics
Platform for Internet Content Selection (PICS)
  • Developed by the World Wide Web Consortium
  • Specification for associating metadata with Internet content
    • Supports self-labels and third-party labels
    • Supports the development of many rating systems
  • Implemented in MS Internet Explorer and other products
how technology tools work

Person ortool classifiescontent

For what age

group is it


Is it educational?

Is it fun?

Tool takes an action







How technology tools work








who does the classification
Who does the classification?
  • Third-party experts
  • Automated tools
  • Local administrators
  • Content providers
  • Survey or vote
classification scheme
Classification scheme

Good for kids

Bad for kids

Characteristics of content

Age suitability

Who created content

rating systems and vocabularies























Rating systems and vocabularies
descriptive versus subjective
Descriptive versus subjective









can t derive descriptive from subjective


Can’t derive descriptive from subjective

Characters not well developed

Gratuitous sex and violence

Bad acting?

Boring plot?

Bad script?

Dull characters?

Unbelievable premise?


Too much violence?

Not enough violence?

  • Web sites
  • FTP, gopher, etc.
  • Chat
  • Instant messaging
  • Newsgroups
  • Email
  • Telnet







mechanisms and interface
Mechanisms and interface
  • Location
  • Updates
  • Customizability
  • Other features
where are the tools located
Personal computer


LAN or local proxy

Remote proxy

Internet service provider

Search engine

Web site

Where are the tools located?
  • How are tools updated?
    • Manual updates required
    • Automatic updates
    • No updates required

Allow and block list elements

Categories of content

Words and phrases

Time of day

Policies for each user

other features
Other features
  • Time limits
  • Separate settings for each child
  • Protect parents’ files
  • Block individual words and pictures vs. full page or whole site
  • Explanation of why blocked vs. silent blocking
  • Diversity of tools in the marketplace is important
  • Need for increased transparency from vendors about the criteria used to classify content
cda sequels
CDA Sequels
  • Child Online Protection Act (COPA) - passed in 1998
    • Banned commercial distribution of material harmful to minors
    • ACLU challenged this law - Supreme Court has twice upheld lower court injunctions against enforcement, back to lower court in October 2006
  • Children’s Internet Protection Act (CIPA) passed in 1999
    • Requires schools and libraries that receive federal funds for Internet access to filter out child pornography, obscene materials, and materials harmful to minors
    • Upheld by Supreme Court in 2003
  • Many state laws
    • Most have been declared unconstitutional
anonymous censorship resistant publishing
Anonymous censorship-resistant publishing
  • The printing press and the WWW can be powerful revolutionary tools
    • Political dissent
    • Whistle blowing
    • Radical ideas
  • but those who seek to suppress revolutions have powerful tools of their own
    • Stop publication
    • Destroy published materials
    • Prevent distribution
    • Intimidate or physically or financially harm author or publisher
anonymity increases censorship resistance
Anonymity increases censorship-resistance
  • Reduces ability to force “voluntary” self-censorship
  • Allows some authors to have their work taken more seriously
    • Reduces bias due to gender, race, ethnic background, social position, etc.
  • Many historical examples of important anonymous publications
    • In the Colonies during Revolutionary War when British law prohibited writings suggesting overthrow of the government
    • Federalist papers
publius design goals
Publius design goals
  • Censorship resistant
  • Tamper evident
  • Source anonymous
  • Updateable
  • Deniable
  • Fault tolerant
  • Persistent
  • Extensible
  • Freely Available
publius overview
Publius Overview




  • Publius Content – Static content (HTML, images, PDF, etc)
  • Publishers – Post Publius content
  • Servers – Host Publius content
  • Retrievers – Browse Publius content
publishing a publius document
Publishing a Publius document



  • Generate secret key and use it to encrypt document
  • Use “secret splitting” to split key into n shares
    • This technique has special property that only k out of n shares are needed to put the key back together
  • Publish encrypted document and 1 share on each of n servers
  • Generate special Publius URL that encodes the location of each share and encrypted document – example: http://!publius!/1e6adsg673h0==hgj7889340==345lsafdfg
retrieving a publius document
Retrieving a Publius document




  • Break apart URL to discover document locations
  • Retrieve encrypted document and share from k locations
  • Reassemble key from shares
  • Decrypt retrieved document
  • Check for tampering
  • View in web browser
publius proxies
Publius proxies






  • Publius proxies running on a user’s local machine or on the network handle all the publish and retrieve operations
  • Proxies also allow publishers to delete and update content
threats and limitations
Threats and limitations
  • Attacks on server resources
    • 100K Content Limit (easy to subvert)
    • Server limits # of files it will store
    • Possibility: use a payment scheme
  • Threats to publisher anonymity
  • “Rubber-Hose Cryptanalysis”
    • Added “don’t update” and don’t delete bit
  • Logging, network segment eavesdropping
  • Collaboration of servers to censor content
    • A feature?
  • Technology that can protect “good” speech also protects “bad” speech
  • What if your dog does publish your secrets to the Internet and you can't do anything about it?
  • Is building a censorship-resistant publishing system irresponsible?
  • If a tree falls in a forest and nobody hears it….
for further reading
For further reading
  • Publius web site
  • Publius chapter in Peer-to-Peer: Harnessing the Power of Disruptive Technologies edited by Andy Oram
  • The Architecture of Robust Publishing Systems. ACM Transactions on Internet Technology 1(2):199-230