Unknowing Information Practices (ACTION-215)

Here's the language from the EFF/Mozilla/Stanford proposal:

> 3.3.2.7 Unknowing Information Practices
> 
> Note: This section was recently added and has not been extensively discussed with stakeholders. Please consider it a preliminary position. 
> 
> A party may receive, retain, and use data as otherwise prohibited by this standard, so long as is unaware of such information practices and has made reasonable efforts to understand its information practices. If a party learns that it possesses information in violation of this standard, it must delete that information at the earliest practical opportunity.