The key problems of public distributed P2P systems are: mutual trust, application security and data integrity.

Things you can't or shouldn't implement as P2P are systems where users have to receive the same data simultaneously, and systems in which the user conceptually has to communicate with a central party.

Peer-to-peer and decentralization can make old protocols interesting again, and put them to new uses, for example, HTML, XML and HTTP. A P2P-extended web could help end users to contribute actively with their own content.

Decentralization and peer-to-peer models have probably more applications than we can imagine. In any areas where scalability and capacity increasingly plays a role, decentralized systems will be implemented eventually.


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