Section 4 creates the defence of public good, which applies both to prosecutions for publication of obscene materials and to the forfeiture proceedings described in Section 3. This allows for a valid defence if the defendant can show that the publication of the materials was justifiable as for the "public good", which is defined as "in the interests of science, literature, art or learning, or of other objects of general concern". Experts and their testimony are admissible for determining the value of such publications. This section was initially treated very strictly by trial judges, but this attitude was reversed after the 1976 trial of the book "Inside Linda Lovelace", where the jury found the publishers not guilty despite the judge saying that "if this isn't obscene, members of the jury, you may think that nothing is obscene". Three years later the Williams Committee recommended that restrictions on written pornography be lifted, and these restrictions have been largely abandoned.