将其他RSS源重新打包到新演示文稿中的合法性是什么？

I know that services like my.yahoo.com allow you to add content from RSS feeds to your personal page, but in general they are links which draw the user to the site which provided the feed. What are the legalities and implications of using RSS feeds as a data source for a site which repackages the data so as to be unrecognizable that it came from said source.I know that services like my.yahoo.com allow yo