At its centre, however, is one simple issue: that of copyright.
出自-2011年12月阅读原文
Copyright laws differ from country to country, but in general protection extends for the duration of an author's life and for a substantial period afterwards, thus allowing the author's heirs to benefit
出自-2011年12月阅读原文
Of the roughly 40 million books in US libraries, for example, an estimated 32 million are in copyright.
出自-2011年12月阅读原文