All this tip-toeing around in todays litigious society is going a little overboard. I mean honestly -- oooh, don't repeat INFORMATION...someone might USE that information and SUE you (queue spooky music and hand waving). I've got news for you -- anyone can sue you for anything at any time. Whether they prevail in court or not is another matter entirely.
Non-realtime stock quote information (usually 15 min delay or so) is public information -- you can do anything you want with it. These actual figures are like data from an almanac.
A particular chart, on the otherhand, is subject to copyright. Yahoo! is usually pretty liberal with their usage polices -- check their terms of service. Just use common sense. If it's for more or less personal use, I wouldn't spend too much time worrying about it. If you're republishing charts, that's quite likely another story.
If you're that concerned, get the raw quote data and generate your own charts using one of the various graphing or charting modules on CPAN.
Matt
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