1. A method for refining an indication of a composition of protectable content, comprising: storing, in a memory structure, a number of items of comparison content comprising at least one item of open source software content; providing, on a computer-based content exchange, instructions regarding a plurality of noise reduction techniques; receiving, at said computer-based content exchange, an item of user content; comparing said item of user content to said items of comparison content; determining, from among said items of comparison content, an identity of one or more potential matches, wherein each said potential match includes a matched portion that is similar to a portion of said item of user content; selecting, using said computer-based content exchange, at least one of said plurality of noise reduction techniques for application to said potential matches; and applying, using said computer-based content exchange, said at least one selected noise reduction technique to eliminate noise from said potential matches.