APPROPRIATION: More aggressive than allusion or citation, appropriation is the excision of material from one context and its reuse in another context, usually with intent to expose some unrecognized irony in the original or to undermine notions of authorial responsibility. The range of possibilites extends from simple reuse, as in collage, to Sherri Levine's rephotographed photos by Edward Weston (see aura).
From "Words of Art"... http://www.arts.ouc.bc.ca/fina/glossary/a_list.html

They have hundreds of other terms that you may find useful or confusing!

Good luck.