Scientology pays members commissions on new recruits they bring in, encouraging Scientology members to "sell" Scientology to others.[90] In addition, Scientology franchises, or missions, pay the church roughly 10% of their gross income.[94] Charges for auditing and other Church-related courses run to tens or hundreds of thousands of dollars.[95][96] Scientology maintains strict control over the use of its symbols, icons, and names. It claims copyright and trademark over its "Scientology cross," and its lawyers have threatened lawsuits against individuals and organizations who have published the image in books and on Web sites. Because of this, it is very difficult for individual groups to attempt to publicly practice Scientology on their own, without any affiliation or connection to the Church of Scientology. Scientology has sued a number of individuals who attempted to set up their own "auditing" practices, using copyright and trademark law to shut these groups down.