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                                                                    EXHIBIT 10.7


                                                                  EXECUTION COPY

              AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT


     THIS AGREEMENT is made as of the 23 day of December, 1999, by and among
CCBN.COM, Inc., a Delaware corporation (the "Company"), the holders of the
Company's Series D Convertible Preferred Stock listed on Schedule I attached
hereto and the several purchasers (the "Series E-1 Investors") of the Series E-l
Convertible Preferred Stock, $.01 par value, of the Company, pursuant to the
Purchase Agreement between the Company and the Series E-1 Investors, dated as of
the date hereof (the "Series E Stock Purchase Agreement"), who are also listed
on Schedule I.

     WHEREAS, the Company entered into a Registration Rights Agreement dated as
of June 9, 1999 (the "Original Agreement") with the holders of the Company's
Series D Preferred Stock (the "Series D Investors") in connection with the sale
of the Company's Series D Convertible Preferred Stock to the Series D Investors;

     WHEREAS, the Company proposes to sell shares of its Series E-l Convertible
Preferred Stock, $.01 par value, to the Series E-1 Investors in the amounts set
forth opposite their respective names on Schedule I of the Series E-l Stock
Purchase Agreement pursuant to the terms of the Series E-l Stock Purchase
Agreement and it is a condition to the closing of such sale that this Agreement
be executed and delivered by the parties hereto; and

     WHEREAS, the Company and the undersigned parties, being the requisite
number of Series D Investors, have agreed to amend and restate the Original
Agreement and the Series E-l Investors who are not parties to the Original
Agreement have agreed to enter into this Amended and Restated Registration
Rights Agreement.

     NOW, THEREFORE, the parties hereto hereby agree that the Original Agreement
is hereby amended and restated in its entirety as follows:

     1.   Certain Definitions. As used in this Agreement, the following terms
          -------------------
shall have the following respective meanings:

     "AOL" shall mean America Online, Inc.
      ---

     "Commission" shall mean the Securities and Exchange Commission, or any
      ----------
other federal agency at the time administering the Securities Act.

     "Common Stock" shall mean the Series A Common Stock, $.001 par value, of
      ------------
the Company, as constituted as of the date of this Agreement.

     "Conversion Shares" shall mean shares of Common Stock issued upon
      -----------------
conversion of the Preferred Shares.
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     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
      ------------
or any similar federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

     "Preferred Shares" shall mean the shares of the Company's Series D
      ----------------
Convertible Preferred Stock, the shares of the Company's Series E Convertible
Preferred Stock and any other shares of the Company's Convertible Preferred
Stock held by Thomson issued and outstanding on the date of this Agreement.

     "Registration Expenses" shall mean the expenses so described in Section 8.
      ---------------------

     "Restricted Stock" shall mean the shares of Common Stock held by Thomson,
      ----------------
any shares of Series E-l Convertible Preferred Stock of any subseries hereafter
acquired by AOL pursuant to the Warrant, and the Conversion Shares, excluding
shares which have been (a) registered under the Securities Act pursuant to an
effective registration statement filed thereunder and disposed of in accordance
with the registration statement covering them or (b) publicly sold pursuant to
Rule 144 under the Securities Act.

     "Securities Act" shall mean the Securities Act of 1933, as amended, or any
      --------------
similar federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

     "Selling Expenses" shall mean the expenses so described in Section 8.
      ----------------

     "Thomson" shall mean Thomson Information Services, Inc.

     "Warrant" shall mean the Stock Subscription Warrant between AOL and the
Company of even date herewith.

     2.   Restrictive Legend. Each certificate representing Preferred Shares or
          ------------------
Conversion Shares shall, except as otherwise provided in this Section 2 or in
Section 3, be stamped or otherwise imprinted with a legend substantially in the
following form:

          "THIS SECURITY HAS NOT BEEN REGISTERED UNDER
          THE SECURITIES ACT OF 1933 OR ANY STATE
          SECURITIES LAWS AND MAY NOT BE TRANSFERRED OR
          OTHERWISE DISPOSED OF UNLESS IT HAS BEEN
          REGISTERED UNDER SUCH ACT AND ALL SUCH
          APPLICABLE LAWS OR AN EXEMPTION FROM
          REGISTRATION IS AVAILABLE."

A certificate shall not bear such legend if in the opinion of counsel
satisfactory to the Company the securities represented thereby may be publicly
sold without registration under the Securities Act and any applicable state
securities laws.

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     3.   Notice of Proposed Transfer. Prior to any proposed transfer of any
          ---------------------------
Preferred Shares or Conversion Shares (other than under the circumstances
described in Sections 4, 5 or 6), the holder thereof shall give written notice
to the Company of its intention to effect such transfer. Each such notice shall
describe the manner of the proposed transfer and, if requested by the Company,
shall be accompanied by an opinion of counsel reasonably satisfactory to the
Company to the effect that the proposed transfer may be effected without
registration under the Securities Act and any applicable state securities laws,
whereupon the holder of such stock shall be entitled to transfer such stock in
accordance with the terms of its notice; provided, however, that no such opinion
                                         --------- -------
of counsel shall be required for a transfer to one or more partners of the
transferor (in the case of a transferor that is a partnership) or to an
affiliated corporation (in the case of a transferor that is a corporation). Each
certificate for Preferred Shares or Conversion Shares transferred as above
provided shall bear the legend set forth in Section 2, except that such
certificate shall not bear such legend if (i) such transfer is in accordance
with the provisions of Rule 144 (or any other rule permitting public sale
without registration under the Securities Act) or (ii) the opinion of counsel
referred to above is to the further effect that the transferee and any
subsequent transferee (other than an affiliate of the Company) would be entitled
to transfer such securities in a public sale without registration under the
Securities Act. The restrictions provided for in this Section 3 shall not apply
to securities which are not required to bear the legend prescribed by Section 2
in accordance with the provisions of that Section.

     4.   Required Registration.
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          (a)  At any time beginning January 1, 2003, the holders of Restricted
Stock constituting at least 50% of the total shares of Restricted Stock then
outstanding may request the Company to register under the Securities Act all or
any portion of the shares of Restricted Stock held by such requesting holder or
holders for sale in the manner specified in such notice, provided that the
shares of Restricted Stock for which registration has been requested shall
constitute at least 25% of the total shares of Restricted Stock originally
issued (or any lesser percentage if the anticipated aggregate offering price
would exceed $10,000,000). For purposes of this Section 4 and Sections 5, 6,
13(a) and 13(d), the term "Restricted Stock" shall be deemed to include the
number of shares of Restricted Stock which would be issuable to a holder of
Preferred Shares upon conversion of all Preferred Shares held by such holder at
such time, provided, however, that the only securities which the Company shall
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be required to register pursuant hereto shall be shares of Common Stock, and
provided, further, however, that, in any underwritten public offering
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contemplated by this Section 4 or Sections 5 and 6, the holders of Preferred
Shares shall be entitled to sell such Preferred Shares to the underwriters for
conversion and sale of the shares of Common Stock issued upon conversion
thereof. Notwithstanding anything to the contrary contained herein, no request
may be made under this Section 4(a) within 120 days after the effective date of
a registration statement filed by the Company covering a firm commitment
underwritten public offering in which the holders of Restricted Stock shall have
been entitled to join pursuant to Sections 5 or 6.

          (b)  At any time after the earlier of: (i) January 1, 2003 and (ii)
the date 180 days following the effective date of the first underwritten public
offering of the Company's securities, when AOL owns at least 5% of the
outstanding capital stock of the Company, on a fully diluted basis (counting all
convertible securities and rights to purchase securities as if fully

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converted or exercised, except that, with respect to the Warrant, Warrant Shares
(as defined in the Warrant) shall be counted only to the extent vested), AOL may
request the Company to register under the Securities Act all or any portion of
the shares of Restricted Stock held by AOL for sale in the manner specified in
such notice, provided that the anticipated aggregate offering price of the
shares of Restricted Stock for which registration has been requested would
exceed $2,500,000, and provided further, that AOL may not make such a request on
more than two (2) occasions or on any occasion within nine (9) months of a
previous request.

          (c)  Following receipt of any notice under this Section 4, the Company
shall immediately notify all holders of Restricted Stock from whom notice has
not been received and shall use its best efforts to register under the
Securities Act, for public sale in accordance with the method of disposition
specified in such notice from requesting holders, the number of shares of
Restricted Stock specified in such notice (and in all notices received by the
Company from other holders within 30 days after the giving of such notice by the
Company). If such method of disposition shall be an underwritten public offering
the Company will designate the managing underwriter of such offering which
managing underwriter shall be reasonably acceptable to a majority of the holders
selling Restricted Stock in such offering. The Company shall be obligated to
register Restricted Stock pursuant to this Section 4 on one occasion only,
provided, however, that such obligation shall be deemed satisfied only when a
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registration statement covering all shares of Restricted Stock specified in
notices received as aforesaid, for sale in accordance with the method of
disposition specified by the requesting holders, shall have become effective
and, if such method of disposition is a firm commitment underwritten public
offering, all such shares shall have been sold pursuant thereto.

          (d)  The Company shall be entitled to include in any registration
statement referred to in this Section 4, for sale in accordance with the method
of disposition specified by the requesting holders, shares of Common Stock to be
sold by the Company for its own account, except as and to the extent that, in
the opinion of the managing underwriter (if such method of disposition shall be
an underwritten public offering), such inclusion would adversely affect the
marketing of the Restricted Stock to be sold. Except for registration statements
on Form S-4, S-8 or any successor thereto, the Company will not file with the
Commission any other registration statement with respect to its Common Stock,
whether for its own account or that of other stockholders, from the date of
receipt of a notice from requesting holders pursuant to this Section 4 until the
completion of the period of distribution of the registration contemplated
thereby.

     5.   Incidental Registration. If the Company at any time (other than
          -----------------------
pursuant to Section 4 or Section 6) proposes to register any of its securities
under the Securities Act for sale to the public, whether for its own account or
for the account of other security holders or both (except with respect to
registration statements on Forms S-4, S-8 or another form not available for
registering the Restricted Stock for sale to the public), each such time it will
give written notice to all holders of outstanding Restricted Stock of its
intention so to do. Upon the written request of any such holder, received by the
Company within 30 days after the giving of any such notice by the Company, to
register any of its Restricted Stock, the Company will use its best efforts to
cause the Restricted Stock as to which registration shall have been so requested
to be included in the securities to be covered by the registration statement
proposed to be filed by the Company, all to the extent requisite to permit the
sale or other disposition by the holder of such

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Restricted Stock so registered, and, if such registration is not an underwritten
public offering, all subject to the right of the Company to reduce (pro rata
among the requesting holders based upon the number of shares of Restricted Stock
owned by such holders) the number of shares of the Purchasers proposed to be
registered to not less than one-third of the total number of shares in the
offering, if and to the extent that the Company shall be of the opinion that
such inclusion would adversely affect the marketing of the securities to be
sold.

     In the event that any registration pursuant to this Section 5 shall be, in
whole or in part, an underwritten public offering of Common Stock, the number of
shares of Restricted Stock to be included in such an underwriting may be reduced
without limitation (pro rata among the requesting holders based upon the number
of shares of Restricted Stock owned by such holders) if and to the extent that
the managing underwriter shall be of the opinion that such inclusion would
adversely affect the marketing of the securities to be sold by the Company
therein, provided, however, that such number of shares of Restricted Stock shall
not be reduced if any shares are to be included in such underwriting for the
account of any person other than the Company or requesting holders of Restricted
Stock.

     Notwithstanding the foregoing provisions, the Company may withdraw any
registration statement referred to in this Section 5 without thereby incurring
any liability to the holders of Restricted Stock.

     6.   Registration on Form S-3. If at any time (i) a holder or holders of
          ------------------------
the Preferred Shares or Restricted Stock then outstanding request that the
Company file a registration statement on Form S-3 or any successor thereto for a
public offering of all or any portion of the shares of Restricted Stock held by
such requesting holder or holders, the reasonably anticipated aggregate price to
the public of which would exceed $1,000,000, and (ii) the Company is a
registrant entitled to use Form S-3 or any successor thereto to register such
shares, then the Company shall use its best efforts to register under the
Securities Act on Form S-3 or any successor thereto, for public sale in
accordance with the method of disposition specified in such notice, the number
of shares of Restricted Stock specified in such notice, provided, however, that
the Company shall not be required to effect a registration pursuant to this
Section 6 more than once in any 12-month period. Whenever the Company is
required by this Section 6 to use its best efforts to effect the registration of
Restricted Stock, each of the procedures and requirements of Section 4
(including but not limited to the requirement that the Company notify all
holders of Restricted Stock from whom notice has not been received and provide
them with the opportunity to participate in the offering) shall apply to such
registration, provided, however, that there shall be no limitation on the number
of registrations on Form S-3 which may be requested and obtained under this
Section 6, and provided, further, however, that the requirements contained in
the first sentence of Section 4(a) shall not apply to any registration on
Form S-3 which may be requested and obtained under this Section 6.

     7.   Registration Procedures. If and whenever the Company is required by
          -----------------------
the provisions of Sections 4, 5 or 6 to use its best efforts to effect the
registration of any shares of Restricted Stock under the Securities Act, the
Company will, as expeditiously as possible:

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          (a)  prepare and file with the Commission a registration statement
(which, in the case of an underwritten public offering pursuant to Section 4,
shall be on Form S-l, or on Form S-3 if the Company is eligible to so file, or
on another form of general applicability satisfactory to the managing
underwriter selected as therein provided) with respect to such securities and
use its best efforts to cause such registration statement to become and remain
effective for the period of the distribution contemplated thereby (determined as
hereinafter provided);

          (b)  prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
the period specified in paragraph (a) above and comply with the provisions of
the Securities Act with respect to the disposition of all Restricted Stock
covered by such registration statement in accordance with the sellers' intended
method of disposition set forth in such registration statement for such period;

          (c)  furnish to each seller of Restricted Stock and to each
underwriter such number of copies of the registration statement and the
prospectus included therein (including each preliminary prospectus) as such
persons reasonably may request in order to facilitate the public sale or other
disposition of the Restricted Stock covered by such registration statement;

          (d)  use its best efforts to register or qualify the Restricted Stock
covered by such registration statement under the securities or "blue sky" laws
of such jurisdictions as the sellers of Restricted Stock or, in the case of an
underwritten public offering, the managing underwriter reasonably shall request,
provided, however, that the Company shall not for any such purpose be required
to qualify generally to transact business as a foreign corporation in any
jurisdiction where it is not so qualified or to consent to general service of
process in any such jurisdiction;

          (e)  use its best efforts to list the Restricted Stock covered by such
registration statement with any securities exchange on which the Common Stock of
the Company is then listed;

          (f)  immediately notify each seller of Restricted Stock and each
underwriter under such registration statement, at any time when a prospectus
relating thereto is required to be delivered under the Securities Act, of the
happening of any event of which the Company has knowledge as a result of which
the prospectus contained in such registration statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing;

          (g)  if the offering is underwritten and at the request of any seller
of Restricted Stock, use its best efforts to furnish on the date that Restricted
Stock is delivered to the under writers for sale pursuant to such registration:
(i) an opinion dated such date of counsel representing the Company for the
purposes of such registration, addressed to the underwriters and to such seller,
stating that such registration statement has become effective under the
Securities Act and that (A) to the best knowledge of such counsel, no stop order
suspending the

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effectiveness thereof has been issued and no proceedings for that purpose have
been instituted or are pending or contemplated under the Securities Act, (B) the
registration statement, the related prospectus and each amendment or supplement
thereof comply as to form in all material respects with the requirements of the
Securities Act (except that such counsel need not express any opinion as to
financial statements contained therein) and (C) to such other effects as
reasonably may be requested by counsel for the underwriters or by such seller or
its counsel and (ii) a letter dated such date from the independent public
accountants retained by the Company, addressed to the underwriters and to such
seller, stating that they are independent public accountants within the meaning
of the Securities Act and that, in the opinion of such accountants, the
financial statements of the Company included in the registration statement or
the prospectus, or any amendment or supplement thereof, comply as to form in all
material respects with the applicable accounting requirements of the Securities
Act, and such letter shall additionally cover such other financial matters
(including information as to the period ending no more than five business days
prior to the date of such letter) with respect to such registration as such
underwriters reasonably may request; and

          (h)  make available for inspection by each seller of Restricted Stock,
any underwriter participating in any distribution pursuant to such registration
statement, and any attorney, accountant or other agent retained by such seller
or underwriter, all financial and other records, pertinent corporate documents
and properties of the Company, and cause the Company's officers, directors and
employees to supply all information reasonably requested by any such seller,
underwriter, attorney, accountant or agent in connection with such registration
statement.

     For purposes of Section 7(a) and 7(b) and of Section 4(c), the period of
distribution of Restricted Stock in a firm commitment underwritten public
offering shall be deemed to extend until each underwriter has completed the
distribution of all securities purchased by it, and the period of distribution
of Restricted Stock in any other registration shall be deemed to extend until
the earlier of the sale of all Restricted Stock covered thereby and 120 days
after the effective date thereof.

     In connection with each registration hereunder, the sellers of Restricted
Stock will furnish to the Company in writing such information with respect to
themselves and the proposed distribution by them as reasonably shall be
necessary in order to assure compliance with federal and applicable state
securities laws.

     In connection with each registration pursuant to Sections 4, 5 or 6
covering an underwritten public offering, the Company and each seller agrees to
enter into a written agreement with the managing underwriter selected in the
manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

     8.   Expenses. All expenses incurred by the Company in complying with
          --------
Sections 4, 5 and 6, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses (including counsel fees)
incurred in connection with complying with state securities or

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"blue sky" laws, fees of the National Association of Securities Dealers, Inc.,
transfer taxes, fees of transfer agents and registrars, costs of insurance and
fees and disbursements of one counsel for the sellers of Restricted Stock
("Sellers' Counsel Expenses"), but excluding any Selling Expenses, are called
"Registration Expenses." All underwriting discounts and selling commissions
applicable to the sale of Restricted Stock are called "Selling Expenses."

     The Company will pay all Registration Expenses in connection with each
registration statement under Sections 4, 5 or 6. All Selling Expenses in
connection with each registration statement under Sections 4, 5 or 6 shall be
borne by the participating sellers in proportion to the number of shares sold by
each, or by such participating sellers other than the Company (except to the
extent the Company shall be a seller) as they may agree.

     9.   Indemnification and Contribution.
          --------------------------------

          (a)  In the event of a registration of any of the Restricted Stock
under the Securities Act pursuant to Sections 4, 5 or 6, the Company will
indemnify and hold harmless each seller of such Restricted Stock thereunder,
each underwriter of such Restricted Stock thereunder and each other person, if
any, who controls such seller or underwriter within the meaning of the
Securities Act, against any losses, claims, damages or liabilities, joint or
several, to which such seller, underwriter or controlling person may become
subject under the Securities Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are based
upon any untrue statement or alleged untrue statement of any material fact
contained in any registration statement under which such Restricted Stock was
registered under the Securities Act pursuant to Sections 4, 5 or 6, any
preliminary prospectus or final prospectus contained therein, or any amendment
or supplement thereof, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse each
such seller, each such underwriter and each such controlling person for any
legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action,
provided, however, that the Company will not be liable in any such case if and
to the extent that any such loss, claim, damage or liability arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission so made in conformity with information furnished by any such
seller, any such underwriter or any such controlling person in writing
specifically for use in such registration statement or prospectus.

          (b)  In the event of a registration of any of the Restricted Stock
under the Securities Act pursuant to Sections 4, 5 or 6, each seller of such
Restricted Stock thereunder, severally and not jointly, will indemnify and hold
harmless the Company, each person, if any, who controls the Company within the
meaning of the Securities Act each officer of the Company who signs the
registration statement, each director of the Company, each underwriter and each
person who controls any underwriter within the meaning of the Securities Act,
against all losses, claims, damages or liabilities, joint or several, to which
the Company or such officer, director, underwriter or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (`or actions in respect thereof) arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in

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the registration statement under which such Restricted Stock was registered
under the Securities Act pursuant to Sections 4, 5 or 6, any preliminary
prospectus or final prospectus contained therein, or any amendment or supplement
thereof, or arise out of or are based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading, and will reimburse the Company and each
such officer, director, underwriter and controlling person for any legal or
other expenses reasonably incurred by them in connection with investigating or
defending any such loss, claim, damage, liability or action, provided, however,
that such seller will be liable hereunder in any such case if and only to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement or omission or alleged
omission made in reliance upon and in conformity with information pertaining to
such seller, as such, furnished in writing to the Company by such seller
specifically for use in such registration statement or prospectus, and provided,
further, however, that the liability of each seller hereunder shall be limited
to the proportion of any such loss, claim, damage, liability or expense which is
equal to the proportion that the public offering price of the shares sold by
such seller under such registration statement bears to the total public offering
price of all securities sold thereunder, but not in any event to exceed the net
proceeds received by such seller from the sale of Restricted Stock covered by
such registration statement.

          (c)  Promptly after receipt by an indemnified party hereunder of
notice of the commencement of any action, such indemnified party shall, if a
claim in respect thereof is to be made against the indemnifying party hereunder,
notify the indemnifying party in writing thereof, but the omission so to notify
the indemnifying party shall not relieve it from any liability which it may have
to such indemnified party other than under this Section 9 and shall only relieve
it from any liability which it may have to such indemnified party under this
Section 9 if and to the extent the indemnifying party is prejudiced by such
omission. In case any such action shall be brought against any indemnified party
and it shall notify the indemnifying party of the commencement thereof, the
indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party), to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 9 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation and of liaison with counsel so selected; provided,
however, that, if the defendants in any such action include both the indemnified
party and the indemnifying party and the indemnified party shall have reasonably
concluded that there may be reasonable defenses available to it which are
different from or additional to those available to the indemnifying party or if
the interests of the indemnified party reasonably may be deemed to conflict with
the interests of the indemnifying party, the indemnified party shall have the
right to select a separate counsel and to assume such legal defenses and
otherwise to participate in the defense of such action, with the expenses and
fees of such separate counsel and other expenses related to such participation
to be reimbursed by the indemnifying party as incurred.

          (d)  In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any holder of
Restricted Stock exercising rights under this Agreement, or any controlling
person of any such holder, makes a claim for

                                       9

<PAGE>

indemnification pursuant to this Section 9 but it is judicially determined (by
the entry of a final judgment or decree by a court of competent jurisdiction and
the expiration of time to appeal or the denial of the last right of appeal) that
such indemnification may not be enforced in such case notwithstanding the fact
that this Section 9 provides for indemnification in such case, or (ii)
contribution under the Securities Act may be required on the part of any such
selling holder or any such controlling person in circumstances for which
indemnification is provided under this Section 9; then, and in each such case,
the Company and such holder will contribute to the aggregate losses, claims,
damages or liabilities to which they may be subject (after contribution from
others) in such proportion so that such holder is responsible for the portion
represented by the percentage that the public offering price of its Restricted
Stock offered by the registration statement bears to the public offering price
of all securities offered by such registration statement, and the Company is
responsible for the remaining portion; provided, however, that, in any such
case, (A) no such holder will be required to contribute my amount in excess of
the public offering price of all such Restricted Stock offered by it pursuant to
such registration statement; and (B) no person or entity guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any person or entity who was not guilty of
such fraudulent misrepresentation.

     10.  Changes in Common Stock or Preferred Stock. If, and as often as, there
          ------------------------------------------
is any change in the Common Stock or the Preferred Stock by way of a stock
split, stock dividend, combination or reclassification, or through a merger,
consolidation, reorganization or recapitalization, or by any other means,
appropriate adjustment shall be made in the provisions hereof so that the rights
and privileges granted hereby shall continue with respect to the Common Stock or
the Preferred Stock as so changed.

     11.  Rule 144 Reporting. With a view to making available the benefits of
          ------------------
certain rules and regulations of the Commission which may at any time permit the
sale of the Restricted Stock to the public without registration, at all times
after 90 days after any registration statement covering a public offering of
securities of the Company under the Securities Act shall have become effective,
the Company agrees to:

          (a)  make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

          (b)  use its best efforts to file with the Commission in a timely
manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act; and

          (c)  furnish to each holder of Restricted Stock forthwith upon request
a written statement by the Company as to its compliance with the reporting
requirements of such Rule 144 and of the Securities Act and the Exchange Act, a
copy of the most recent annual or quarterly report of the Company, and such
other reports and documents so filed by the Company as such holder may
reasonably request in availing itself of any rule or regulation of the
Commission allowing such holder to sell any Restricted Stock without
registration.

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<PAGE>

     12.  Representations and Warranties of the Company. The Company represents
          ---------------------------------------------
and warrants to you as follows:

          (a)  The execution, delivery and performance of this Agreement by the
Company have been duly authorized by all requisite corporate action and will not
violate any order of any court or other agency of government, the Charter or By-
laws of the Company or any provision of any indenture, agreement or other
instrument to which it or any or its properties or assets is bound, conflict
with, result in a breach of or constitute (with due notice or lapse of time or
both) a default under any such indenture, agreement or other intent or result in
the creation or imposition of any lien, charge or encumbrance of any nature
whatsoever upon any of the properties or assets of the Company.

          (b)  This Agreement has been duly executed and delivered by the
Company and constitutes the legal, valid and binding obligation of the Company,
enforceable in accordance with its terms, except insofar as enforceability may
be limited by applicable bankruptcy, insolvency, reorganization, moratorium, or
similar laws of general application affecting enforcement of creditors' rights
and except as to enforceability of the indemnification and contribution
provisions.

     13.  Miscellaneous.
          -------------

          (a)  All covenants and agreements contained in this Agreement by or on
behalf of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns of the parties hereto (including without
limitation transferees of any Preferred Shares or Restricted Stock), whether so
expressed or not, provided, however, that registration rights conferred herein
on the holders of Preferred Shares or Restricted Stock shall only inure to the
benefit of a transferee of Preferred Shares or Restricted Stock if (i) there is
transferred to such transferee at least 50% of the total shares of Restricted
Stock originally issued pursuant to the Purchase Agreement to the direct or
indirect transferor of such transferee or (ii) such transferee is a partner,
shareholder or affiliate of a party hereto.

          (b)  All notices, requests, consents and other communications
hereunder shall be in writing and shall be delivered in person, mailed by
certified or registered mail, return receipt requested, or sent by telecopier or
telex, addressed as follows:

     if to the Company or any other party hereto, at the address of such party
set forth in the Purchase Agreement;

     if to any subsequent holder of Preferred Shares or Restricted Stock, to it
at such address as may have been furnished to the Company in writing by such
holder;

or, in any case, at such other address or addresses as shall have been furnished
in writing to the Company (in the case of a holder of Preferred Shares or
Restricted Stock) or to the holders of Preferred Shares or Restricted Stock (in
the case of the Company) in accordance with the provisions of this paragraph.

                                      11

<PAGE>

          (c)  This Agreement shall be governed by and construed in accordance
with the laws of Delaware.

          (d)  This Agreement may not be amended or modified, and no provision
hereof may be waived, without the written consent of the Company and the holders
of at least two-thirds of the outstanding shares of Restricted Stock; provided
that AOL's rights and obligations hereunder may not be amended or modified
without the written consent of AOL and Thomson's rights and obligations
hereunder may not be amended or modified without the written consent of Thomson.

          (e)  This Agreement may be executed in two or more counterparts, each
of which shall be deemed an original, but all of which together shall constitute
one and the same intent.

          (f)  The obligations of the Company to register shares of Restricted
Stock under Sections 4, 5 or 6 shall terminate on the tenth anniversary of the
date of this Agreement.

          (g)  If requested in writing by the underwriters for an underwritten
public offering of securities of the Company, each holder of Restricted Stock
who is a party to this Agreement (if still a holder of Restricted Stock at the
time) shall agree not to sell publicly any shares of Restricted Stock or any
other shares of Common Stock (other than shares of Restricted Stock or other
shares of Common Stock being registered in such offering), without the consent
of such underwriters (the "Lock-Up Obligation"), for a period of not more than
180 days in the case of an initial public offering or 90 days in the case of all
other public offerings following the effective date of the registration
statement relating to such offering; provided, however, that all persons
entitled to registration rights with respect to shares of Common Stock who are
not parties to this Agreement, all other persons selling shares of Common Stock
in such offering, and all executive officers and directors of the Company shall
also have agreed not to sell publicly their Common Stock under the circumstances
and pursuant to the terms set forth in this Section 13(g). Notwithstanding the
foregoing, the Lock-Up Obligation shall not apply to AOL, with respect to the
Shares purchased by AOL pursuant to the Warrant only, for any offering other
than the Company's initial public offering.

          (h)  Notwithstanding the provisions of Section 7(a), the Company's
obligation to file a registration statement, or cause such registration
statement to become and remain effective, shall be suspended for a period not to
exceed 90 days in any 12-month period (i) if there exists at the time material
non-public information relating to the Company which, in the reasonable opinion
of the Company, should not be disclosed or (ii) if such filing would materially
and adversely affect a pending or scheduled public offering of the Company's
securities.

          (i)  The Company shall not grant to any third party any registration
rights more favorable than or inconsistent with any of those contained herein,
so long as any of the registration rights under this Agreement remains in
effect.

                                      12

<PAGE>

          (j)  If any provision of this Agreement shall be held to be illegal,
invalid or unenforceable, such illegality, invalidity or unenforceability shall
attach only to such provision and shall not in any manner affect or render
illegal, invalid or unenforceable any other provision of this Agreement, and
this Agreement shall be carried out as if any such illegal, invalid or
unenforceable provision were not contained herein.

          (k)  Thomson and the Company agree that the provisions of Sections
2.01 of the Amended and Restated Agreement Among Thomson and Founders, dated as
of March 31, 1999, are hereby deleted from that agreement and shall be of no
further force or effect.

           [The remainder of this page is left blank intentionally.]

                                      13

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Amended and
Restated Registration Rights Agreement as of the date and year first above
written.


                              CCBN. COM, INC.

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: Chairman & CEO
                                   ---------------------------------------------

                              PSILOS GROUP PARTNERS, L.P.

                              By:  PSILOS GROUP INVESTORS, LLC
                                   its General Partner

                                   By:  /s/ [ILLEGIBLE]
                                        ----------------------------------------
                                   Its: ________________________________________


                              CCP/PSILOS CCBN.COM, L.L.C.

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: _____________________________________________


                              TORONTO DOMINION INVESTMENTS, INC.

                              By:  /s/ Martha L. Gariep
                                   ---------------------------------------------
                              Its: Vice President
                                   ---------------------------------------------


                              INFORMATION ASSOCIATES-II, L.P.

                              By:  TRIDENT CAPITAL MANAGEMENT-II, L.L.C., its
                                   General Partner

                                   By:  /s/ [ILLEGIBLE]
                                        ----------------------------------------
                                   Its: Managing Director
                                        ----------------------------------------


                              IA-II AFFILIATES FUND, L.L.C

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: Managing Director
                                   ---------------------------------------------
<PAGE>

Additional Signature Page to CCBN Amended and Restated Registration Rights
Agreement



                              /s/ Richard Hanlon
                              --------------------------------------------------
                              Richard Hanlon


                              Robert C. McCormack 1967 Trust 02-33942

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: Trustee
                                   ---------------------------------------------


                              Newbury Street International, LLC

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: _____________________________________________


                              Parker Family Limited Partnership

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: General Partner
                                   ---------------------------------------------

                              Thomson Information Services, Inc.

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: Vice President
                                   ---------------------------------------------

                              America Online, Inc.

                              By:  /s/ [ILLEGIBLE]
                                   ---------------------------------------------
                              Its: VP - Business Affairs
                                   ---------------------------------------------