MPEG-4 differs from other codecs by making royalty payments not only for the encoder and Decorder occur, but possibly also for the use of videos, in MPEG-4 compressed. Are the videos with revenue - by the audience pays for videos, or the supplier with the help of videos, even indirectly, for example, revenue generated by banner advertising - may need to be paid royalties. Currently, however, this kind of distribution of royalty payments freed - and later, a minimum limit of 100,000 grants for such payments. The linked article by www.video-flash.de explain the relationship more precisely. It is also interesting to Talk whether the Open Source implementation of the H.264 (MPEG-4 AVC) codec is legal or not.