[via Joi Ito, 1] Google added an Open Content resp. public domain relevant search option called \”Usage Rights\” to their Advanced Search form (the option is currently not available in German) [2]. There are three options for the selection \”as_rights\”:
- aren\’t filtered by license
- allow some forms of re-use
- can be freely modified, adapted or built upon
The appropriate option values are:
- BLANK
- cc_publicdomain|cc_attribute
- (cc_publicdomain|cc_attribute).-(cc_noncommercial|cc_nonderived|cc_sharealike)
As Joi Ito already mentioned, Yahoo! has added easy to use check boxes. I agree that the Google search form could be more userfriendly. If I try to build a custom query string, the search results are actually but not obviously \”as_rights\” relevant [3].
[1] http://joi.ito.com/archives/2005/11/04/google_cc_good.html
[2] http://google.ch/advanced_search?hl=en
[3] http://google.ch/search?as_q=jazz&as_rights=cc_publicdomain|cc_attribute