license/copyright change

libavcodec/Makefile

libavcodec/a52dec.c

libavcodec/ac3dec.c

libavcodec/ac3enc.c

libavcodec/alpha/asm.h

libavcodec/alpha/dsputil_alpha.c

libavcodec/alpha/mpegvideo_alpha.c

libavcodec/alpha/pixops.h

libavcodec/armv4l/dsputil_arm.c

libavcodec/common.c

libavcodec/dct-test.c

libavcodec/dsputil.c

libavcodec/dsputil.h

libavcodec/h263.c

libavcodec/h263dec.c

libavcodec/i386/cputest.c

libavcodec/i386/dsputil_mmx.c

libavcodec/i386/dsputil_mmx_avg.h

libavcodec/i386/fdct_mmx.c

libavcodec/i386/motion_est_mmx.c