Odd output. Over my head, thought I'd pop it up here.

[jamesaepp]

Command Issued:

youtube-dl -A -t -c http://www.youtube.com/playlist?list=listid

Output:

.
.

[download] Downloading video #4 of 21
[youtube] DzyKSyLavUY: Downloading webpage
[youtube] DzyKSyLavUY: Downloading video info webpage
[youtube] DzyKSyLavUY: Extracting video information
[youtube] DzyKSyLavUY: Encrypted signatures detected.
[youtube] DzyKSyLavUY: Downloading js player vflbxes4n
WARNING: Writing cache to u'/home/james/.cache/youtube-dl/youtube-sigfuncs/js_vflbxes4n_86.json' failed: Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 345, in _extract_signature_function
write_json_file(cache_spec, cache_fn)
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 216, in write_json_file
with open(fn, 'wb') as f:
IOError: [Errno 13] Permission denied: u'/home/james/.cache/youtube-dl/youtube-sigfuncs/js_vflbxes4n_86.json'

[youtube] DzyKSyLavUY: Downloading js player vflbxes4n
WARNING: Writing cache to u'/home/james/.cache/youtube-dl/youtube-sigfuncs/js_vflbxes4n_87.json' failed: Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 345, in _extract_signature_function
write_json_file(cache_spec, cache_fn)
File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 216, in write_json_file
with open(fn, 'wb') as f:
IOError: [Errno 13] Permission denied: u'/home/james/.cache/youtube-dl/youtube-sigfuncs/js_vflbxes4n_87.json'

. .

[phihag]

It looks like you've run youtube-dl with elevated privileges in the same directory. The output is harmless, run

sudo rm -rf ~/.cache/youtube-dl

once to make it go away. Unless you are updating youtube-dl, do not run it with sudo.