Are libav and x264 DFSG-free now?

[Eugen Dedu]

Hi,

I am maintainer of ptlib/opal/ekiga packages and I have noticed that 
since recently some in-the-past non-free codecs (H264 for example) are 
now working since they are in debian main.

I would like to know why libav (ffmpeg) and x264 are now found in main 
while before they were not.  Why before they were considered DFSG 
non-free, and now they are considered DFSG-free?  Has DSFG-freeness 
changed?  Have ftp-master changed their mind?  To resume: what has 
changed between a few years ago when they were NOT in main and now when 
they ARE in main?

(I have looked on Internet without finding the answer.)

Best regards,
-- 
Eugen Dedu
http://eugen.dedu.free.fr