http://www.earlham.edu/~peters/fos/2008/05/reasons-to-remove-permission-barriers.html

Comment. Klaus is right and I've often made my own similar lists. Here's one from my interview with Richard Poynder (October 2007, p. 37-39):

...[T]here are good reasons to exceed fair use [and therefore to remove permission barriers], for example, to quote long excerpts, print full-text copies, email copies to students or colleagues, burn copies on CDs for bandwidth-poor parts of the world, distribute semantically-tagged or otherwise enhanced versions of a text, migrate copies to new formats or media to keep a text readable as technologies change, archive copies for preservation, include the work in a database or mashup, copy the text for indexing, text-mining, or other kinds of processing, make an audio recording of the text, or translate it into another language....

We're already well into the era in which all serious research is mediated by sophisticated software....Over time, we'll rely more and more on tools for crunching or reusing digital texts — for searching, mining, summarising, translating, querying, linking, recommending, alerting, and other kinds of processing. An important purpose of open access is to facilitate this future and give these tools the widest possible scope of operation....