 This pledge has been accepted with some skepticism.Microsoft has claimed that free software such as OpenOffice.org and the Linux kernel violate 235 Microsoft patents and said that it will seek licence fees, but has so far failed to disclose which patents they may violate.However, the 2009 lawsuit against TomTom involved the use of Microsoft's patents for long filenames on FAT filesystems, the code for which was in the Linux kernel, not in any TomTom-developed software.