Problem: Post-punk:

Post-punk is a heterogeneous type of rock music that emerged in the wake of the punk movement of the 1970s. Drawing inspiration from elements of punk rock while departing from its musical conventions and wider cultural affiliations, post-punk music was marked by varied, experimentalist sensibilities and its "conceptual assault" on rock tradition. Artists embraced electronic music, black dance styles and the avant-garde, as well as novel recording technology and production techniques. The movement also saw the frequent intersection of music with art and politics, as artists liberally drew on sources such as critical theory, cinema, performance art and modernist literature. Accompanying these musical developments were subcultures that produced visual art, multimedia performances, independent record labels and fanzines in conjunction with the music.

When did the popularity of post-punk end?
---
A: unanswerable

Problem: Spectre (2015 film):

In September 2015 it was announced that Sam Smith and regular collaborator Jimmy Napes had written the film's title theme, "Writing's on the Wall", with Smith performing it for the film. Smith said the song came together in one session and that he and Napes wrote it in under half an hour before recording a demo. Satisfied with the quality, the demo was used in the final release.

Who wrote the song in under fifteen minutes?
---
A: unanswerable

Problem: Federal Bureau of Investigation:

In August 2007 Virgil Griffith, a Caltech computation and neural-systems graduate student, created a searchable database that linked changes made by anonymous Wikipedia editors to companies and organizations from which the changes were made. The database cross-referenced logs of Wikipedia edits with publicly available records pertaining to the internet IP addresses edits were made from. Griffith was motivated by the edits from the United States Congress, and wanted to see if others were similarly promoting themselves. The tool was designed to detect conflict of interest edits. Among his findings were that FBI computers were used to edit the FBI article in Wikipedia. Although the edits correlated with known FBI IP addresses, there was no proof that the changes actually came from a member or employee of the FBI, only that someone who had access to their network had edited the FBI article in Wikipedia. Wikipedia spokespersons received Griffith's "WikiScanner" positively, noting that it helped prevent conflicts of interest from influencing articles as well as increasing transparency and mitigating attempts to remove or distort relevant facts.

What did not motivate Griffith?
---
A: unanswerable

Problem: Copyright infringement:

Copyright holders frequently refer to copyright infringement as theft. In copyright law, infringement does not refer to theft of physical objects that take away the owner's possession, but an instance where a person exercises one of the exclusive rights of the copyright holder without authorization. Courts have distinguished between copyright infringement and theft. For instance, the United States Supreme Court held in Dowling v. United States (1985) that bootleg phonorecords did not constitute stolen property. Instead, "interference with copyright does not easily equate with theft, conversion, or fraud. The Copyright Act even employs a separate term of art to define one who misappropriates a copyright: '[...] an infringer of the copyright.'" The court said that in the case of copyright infringement, the province guaranteed to the copyright holder by copyright law certain exclusive rights is invaded, but no control, physical or otherwise, is taken over the copyright, nor is the copyright holder wholly deprived of using the copyrighted work or exercising the exclusive rights held.

What haven't courts said there is a difference between?
---
A:
unanswerable