[From another comment]: Holders sometimes even prefer their content to spread via "infringers", such as transcripts of commercials which are often re-performed in recordings by voice talent as samples of their work (demos). The client who paid the agency to write the script usually prefers more people hear about them. This is so common even SAG-Aftra, the union representing some voice talent, suggests (in writing) that it is fine to transcribe and re-record commercial scripts.