"even probable harm, may be impossible in an area where the effect of a new technology is speculative, and requiring such proof would present the “real danger … of confining the scope of an author’s rights on the basis of the present technology so that, as the years go by, his copyright loses much of its value because of unforeseen technical advances.” Register’s Supplementary Report 14. Infringement thus would be found if the copyright owner demonstrates a reasonable possibility that harm will result from the proposed use. When the use is one that creates no benefit to the public at large, copyright protection should not be denied on the basis that a new technology that may result in harm has not yet done so. The Studios have identified a number of ways in which VTR recording could damage their copyrights. VTR recording could reduce their ability to market their works in movie theaters and through the rental or sale of pre- recorded videotapes or videodiscs; it also could reduce their rerun audience, and consequently the license fees available to them for repeated showings. Moreover, advertisers may"