The Public Patent Foundation has found that version 2.4 and 2.6 of the Linux kernel potentially violate 283 not yet court-validated patents. 98 of the patents are owned by Linux allies such as Cisco, HP, IBM, Intel, Novell, Oracle, Red Hat, and Sony. IBM holds 60 patents, HP holds 20 patents and Intel holds 11 patents. The kernel potentially violates 27 Microsoft patents. Open Source Risk Management has a PDF press release on the Public Patent Foundation’s findings.