A bit hypothetical on a couple of points. Firstly, it may be a channel showing Jumanji etc. - possibly "kids' TV". I'm not sure what they're saying with "en plein canal" - is this an online channel or something? I'll risk suggesting it may be "...with full unrestricted online access".
Originally I was thinking on the lines of "pay-to-view" etc., but perhaps "subscriber" is a good word to use these days.
As for TNT, I'm aware it stands for Turner Network Television, but I haven't seen enough evidence to convince me that's what it means here. It's also the French acronym meaning "digital terrestrial television".

Anyway hope it's all right to have another crack at this!

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Note added at 2003-09-20 20:01:19 (GMT)
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See also:
http://www.kidscreen.com/articles/magazine/20030801/canalj.h...

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Note added at 2003-09-20 20:11:50 (GMT)
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My theory is that it\'s a cable and satellite channel.

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Note added at 2003-09-21 07:07:50 (GMT)
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See:
www.tdf.fr

www.lagardere.fr/groupe/media_audiovisuel_CJ.shtml

and in English:
europa.eu.int/ISPO/infosoc/telecompolicy/ en/idateuk98.pdf

I found these sites useful for the meaning of the French acronym TNT and other information.

I think the channel is for children, and maybe a little way into the teens. Perhaps \"jeunesse\" in this context covers the category which tends to be \"kids\" as in \"Carlton Kids\" in English.

\"...for full subscriber access\" is perhaps an adequate translation of the end of the sentence. If a longer phrase seems appropriate, my preferred version is now \"...full unrestricted subscriber access\". My theory: it means you get all of it - everything that\'s on the satellite version of the channel can be received on DTT too
(\"unrestricted\" - perhaps no parental controls or other restrictions). But now I\'m taking account of David Sirett\'s version too.

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Note added at 2003-09-21 07:35:48 (GMT)
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I saw the phrase \"full unrestricted online subscriber access\" (or possibly \"...access for subscribers\") in the relevant context. That was the starting point of my line of thought.