CcSearch at http://search.creativecommons.org (also accessible via Firefox) simply "frames" CC-enabled search engines.

To accomplish this, candidate search engines need to support the following query components in GET URLs:

• keyword
• restriction to only CC-licensed or PD results
  • restriction to only results that permit commercial use
  • restriction to only results that permit derivative works

Typically, these will map to four URLs, each with an arbitary keyword parameter.

Example implementations

Yahoo! Web Search

• Any CC
  • http://search.yahoo.com/search?cc=1&p=KEYWORDS
• Permits commercial use
  • http://search.yahoo.com/search?cc=1&ccs=c&p=KEYWORDS
• Permits derivative works
  • http://search.yahoo.com/search?cc=1&ccs=e&p=KEYWORDS
• Permits commercial and derivative use
  • http://search.yahoo.com/search?cc=1&ccs=c&ccs=e&p=KEYWORDS