[iPrima.cz] New DRM

[DVD-CZ]

Hi,
rather than bug of youtube-dl, it is a new behavior of this site resulting in disfunction of youtube-dl.
On the web page there appeared a bar asking for confirmation to use DRM to play the videos. But it worked even without confirming it. But youtub-dl does not.

$ youtube-dl --verbose http://play.iprima.cz/ohnivy-kure/ohnivy-kure-77-hra-o-jablka
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'http://play.iprima.cz/ohnivy-kure/ohnivy-kure-77-hra-o-jablka']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.01.31
[debug] Python version 2.7.13 - Linux-4.9.5-100.fc24.i686+PAE-i686-with-fedora-24-Twenty_Four
[debug] exe versions: ffmpeg 3.1.6, ffprobe 3.1.6, rtmpdump 2.4
[debug] Proxy map: {}
[IPrima] ohnivy-kure-77-hra-o-jablka: Downloading webpage
[IPrima] p313497: Downloading player
ERROR: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 694, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 369, in extract
return self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/iprima.py", line 87, in _real_extract
self._sort_formats(formats)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 936, in _sort_formats
raise ExtractorError('No video formats found')
ExtractorError: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

I will also try to find the cause and suggest a fix, if I ll be able to.
M.