Why should a Trust and Estate professional not use BigCharts or Yahoo?

The Historical Quotes section of BigCharts.com explicitly states:

4.0 Ownership of Information; Downloading of Materials; Retransmission and Redistribution of Data.

The Website is made available solely as a convenience to you for general informational purposes for your internal, non-commercial use, subject at all times to these Terms and Conditions. Unless otherwise noted, all right, title and interest in the Website, and information made available in the Website ("Information"), in all languages, formats and media throughout the world, including all copyrights and trademarks therein, are and shall continue to be the exclusive property of FT Interactive Data, its parent corporation, subsidiary corporations, affiliates, licensors, or third party data providers ("Data Providers"), or used under principles of "fair use." These Terms and Conditions are subject to any requirements of the Data Providers under FT Interactive Data's agreements with such Data Providers. Certain materials may be made available for download from the Website. Subject to these Terms and Conditions, FT Interactive Data grants you permission to download and copy such materials solely for your internal, non-commercial use; provided that all copyright notices appearing on the originals are duplicated on all copies thereof; and provided further, that you do not modify the materials in any way. Without limiting any other right or remedy available to FT Interactive Data, at law or in equity, the permission herein granted will automatically terminate in the event you breach the terms of this paragraph and, in such event you must destroy immediately all downloaded materials in your possession, custody or control.

EXCEPT AS OTHERWISE EXPRESSLY PERMITTED BY THE PRECEDING PARAGRAPH, YOU AGREE NOT TO REPRODUCE, RETRANSMIT, DISSEMINATE, SELL, DISTRIBUTE, PUBLISH, BROADCAST, CIRCULATE OR PROVIDE, THE INFORMATION OR SERVICES IN ANY MANNER OR FOR ANY PURPOSES (PERSONAL OR BUSINESS) WITHOUT THE PRIOR EXPRESS WRITTEN CONSENT OF FT Interactive Data AND/OR THE RELEVANT DATA PROVIDER(S).

The Historical Quotes section of Yahoo.com explicitly states: By accessing the Yahoo! site, you agree not to redistribute the information found therein. Yahoo Finance explicitly states in its Historical Finance section:

All information provided as is for informational purposes only, not intended for trading purposes or advice. Neither Yahoo! nor any independent providers is liable for any informational errors, incompleteness, or delays, or for any actions taken reliance on information contained herein.

In fact, the Yahoo site also says, this website may contain inadvertent factual inaccuracies and typographical errors (and) expressly disclaims all liability for the use or interpretation contained.

In addition, using the Yahoo site may be an illegal means to research security prices. The Yahoo disclaimer also states: By accessing the Yahoo! site, you agree not to redistribute the information found therein.

By breaching these policies, an individual/institution can put itself in a very precarious situation by abdicating their fiduciary responsibilities and possibly violating copyright laws.

Both sites only price equities and mutual funds. They do not value international securities, bonds, or fixed income instruments. Nor do they generate the dividend or accrual calculations, mean pricing, and inverse weighting required to complete an estate/gift tax return. It is an incomplete tool for a trust and estate professional.