POWER OF ATTORNEY
For Executing Forms 3, 4 and 5


	Know all by these presents, that the undersigned hereby constitutes and
appoints each of Robert P. Nault, Kathryn L. Leach, Christopher R. Dollase and
Hal J. Leibowitz signing singly, his or her true and lawful attorney-in-fact to:
	(1)	execute on behalf of the undersigned Forms 3, 4 and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934, as amended, and the rules
thereunder;
	(2)	perform all acts on behalf of the undersigned that may be necessary or
desirable to complete the execution of any such Forms 3, 4 and 5 and the timely
filing of such forms with the United States Securities and Exchange Commission
and any other authority; and
	(3)	take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in his or
her discretion.
	The undersigned hereby grants to each such attorney-in-fact full power and
authority to perform every act and thing whatsoever requisite, necessary and
proper to be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the undersigned might or could
do if personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or his or her
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted.  The
undersigned acknowledges that the foregoing attorneys in fact, in serving in
such capacity at the request of the undersigned, are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934, as amended.
	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of February 1, 2006.



															/s/Richard B. Welch
						----------------------
						Richard B. Welch