I don't suggest using anything but vBSEO.. I'd use vb default over any of the "free" versions.
There is a big bug with mod_rewrite that many don't know about but there can be huge amounts of duplicate content made.
to edit the copyright, you look at the config_vbseo in the includes folder ( go figure

)
Code:
// ****** COPYRIGHT NOTICE ******
// As per the License Agreement (www.crawlability.com/vbseo/license/), you may NOT remove (or modify) the
// copyright notice. Select one of the copyright notices to be displayed in ALL pages enhanced by vBSEO:
//
// Linked
// 1. Search Engine Friendly URLs by vBSEO 3.0.0 RC8
// 2. Content Relevant URLs by vBSEO 3.0.0 RC8
// 3. Search Engine Optimization by vBSEO 3.0.0 RC8
// 4. SEO by vBSEO 3.0.0 RC8
// 9. Ping/Trackback Enabled by vBSEO 3.0.0 RC8
//
// Not Linked
// 5. Search Engine Friendly URLs by vBSEO 3.0.0 RC8 ? 2007, Crawlability, Inc.
// 6. Content Relevant URLs by vBSEO 3.0.0 RC8 ? 2007, Crawlability, Inc.
// 7. Search Engine Optimization by vBSEO 3.0.0 RC8 ? 2007, Crawlability, Inc.
// 8. SEO by vBSEO 3.0.0 RC8 ? 2007, Crawlability, Inc.
// 10. Ping/Trackback Enabled by vBSEO 3.0.0 RC8 ? 2007, Crawlability, Inc.
//
//
// When this option is set to '0', the system auto-selects a copyright notice for you. Setting this
// option to a value from '1' to '10' will display the copyright notice of your preference.