4.6. Considerations. This Agreement may be performed in any number of considerations, each of which shall be deemed original at the time of its performance and delivery, but shall together constitute a single instrument. Digital copies of this Agreement are considered acceptable. However, the existence of the UKUSA agreement was not publicly announced until 2005.  The content of the agreement was officially made available to the public on June 25, 2010. Four days later, the deal was described by Time Magazine as one of the «most important documents in the history of the Cold War.»  Much of the information exchange takes place through the highly sensitive STONEGHOST network, which is said to have contained «some of the Western world`s best-kept secrets.» .