Jesse has prepared a set of guidelines which advises our members fairly well. I would suggest providing a license agreement of some sort with your Beta version yes.
This is one I have previously used:
Quote: "
License Agreement
As a condition of your accessing this area, you agree to be bound by the following terms and conditions:
The games software was created by YOUR NAME HERE and all copyright and other rights in such is owned by YOUR NAME HERE. While YOUR NAME HERE allows you to access, download and use the software for non-commercial, home use you hereby expressly agree that you will not otherwise copy, distribute, modify, or (to the extent not otherwise permitted by law) decompile, disassemble or reverse engineer the games software.
THE GAMES SOFTWARE IS MADE AVAILABLE BY YOUR NAME HERE AS-IS AND WITHOUT WARRANTY OF ANY KIND BY YOUR NAME HERE. YOUR NAME HERE HEREBY EXPRESSLY DISCLAIMS ANY SUCH WARRANTY, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, YOUR NAME HERE SHALL NOT BE LIABLE IN DAMAGES OR OTHERWISE FOR ANY DAMAGE OR INJURY FROM DOWNLOADING, DECOMPRESSING, RUNNING OR ATTEMPTING TO RUN, USING OR OTHERWISE DEALING WITH, IN ANY WAY, THE GAMES SOFTWARE CONTAINED IN THIS AREA, NOR SHALL YOUR NAME HERE BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, EXEMPLARY OR OTHER TYPES OF DAMAGES ARISING FROM ACCESS TO OR USE OF THE GAMES SOFTWARE.
YOU HEREBY AGREE TO INDEMNIFY, DEFEND AND HOLD HARMLESS YOUR NAME HERE AND ITS DIRECTORS, OFFICERS, EMPLOYEES, AGENTS, CONSULTANTS AND CONTRACTORS AGAINST ALL LIABILITY OF ANY KIND ARISING OUT OF YOUR DOWNLOADING, DECOMPRESSING, RUNNING OR ATTEMPTING TO RUN, USING OR OTHERWISE DEALING WITH, IN ANY WAY, THE GAMES SOFTWARE.
YOUR NAME HERE MAKES NO WARRANTIES OR REPRESENTATIONS THAT THE GAMES SOFTWARE IS FREE OF MALICIOUS PROGRAMMING, INCLUDING, WITHOUT LIMITATION, VIRUSES, TROJAN HORSE PROGRAMS, WORMS, MACROS AND THE LIKE. AS THE PARTY ACCESSING THE GAMES SOFTWARE IT IS YOUR RESPONSIBILITY TO GUARD AGAINST AND DEAL WITH THE EFFECTS OF ANY SUCH MALICIOUS PROGRAMMING.
"
EDIT: Attached an rtf version...
EDIT2: Removed the name of the games company I robbed... I mean borrowed it from...