Z:gnu-www-ja-200104 seminar--d6e420-Patent rights are most often g/en

Patent rights are most often granted expressly, through detailed language in a license. However, express patent grants are not the exclusive way rights in patents are granted by patentees. Even without express language, patent rights can be granted by a patentee's actions or behavior. The GPL contains no express patent grant. Does that mean it grants less rights in the licensor's patents than other licenses which do? Or, does the GPL, in its silence, actually result in a grant of patent rights to the licensee greater than what occurs through many other Free Software and &ldquo;Open Source&rdquo; licenses?