From P2P Foundation

Definition

By the FFII:

"The specification is not public, neither normalized by any recognized national or international standardization body. This is no matter how widely used the format/protocol/methodology/process/etc is. If widely used, it is common to denominate it in slang language as "de facto standard", but it is not a standard." (http://action.ffii.org/openstandards)

More Information

See: Open Standards